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Finding the Fourth Proportional to 607,389.80, 911,084.70 and 439,428.20

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Solution

The fourth proportional to 607,389.80, 911,084.70 and 439,428.20 is: 659,142.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    607,389.80 : 911,084.70 = 439,428.20 : x
  2. Step 2: Convert to fraction form
    607,389.80/911,084.70 = 439,428.20/x
  3. Step 3: Cross multiply
    607,389.80x = 911,084.70 × 439,428.20
  4. Step 4: Simplify right side
    607,389.80x = 400,356,309,768.54
  5. Step 5: Solve for x
    x = 400,356,309,768.54/607,389.80
  6. Step 6: Final answer
    x = 659,142.30

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.