Home / 3,478.40-5,217.10-1,287.12

Finding the Fourth Proportional to 3,478.40, 5,217.10 and 1,287.12

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Solution

The fourth proportional to 3,478.40, 5,217.10 and 1,287.12 is: 1,930.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,478.40 : 5,217.10 = 1,287.12 : x
  2. Step 2: Convert to fraction form
    3,478.40/5,217.10 = 1,287.12/x
  3. Step 3: Cross multiply
    3,478.40x = 5,217.10 × 1,287.12
  4. Step 4: Simplify right side
    3,478.40x = 6,715,033.75
  5. Step 5: Solve for x
    x = 6,715,033.75/3,478.40
  6. Step 6: Final answer
    x = 1,930.49

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Half scale
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Double scale
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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.