Home / 645,145.20-904,136.40-645,145.20

Finding the Fourth Proportional to 645,145.20, 904,136.40 and 645,145.20

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Solution

The fourth proportional to 645,145.20, 904,136.40 and 645,145.20 is: 904,136.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,145.20 : 904,136.40 = 645,145.20 : x
  2. Step 2: Convert to fraction form
    645,145.20/904,136.40 = 645,145.20/x
  3. Step 3: Cross multiply
    645,145.20x = 904,136.40 × 645,145.20
  4. Step 4: Simplify right side
    645,145.20x = 583,299,258,605.28
  5. Step 5: Solve for x
    x = 583,299,258,605.28/645,145.20
  6. Step 6: Final answer
    x = 904,136.40

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Half scale
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Double scale
Find fourth proportional to 645,146.20, 904,137.80 and 645,146.20
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.