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Finding the Fourth Proportional to 781.70, 1,078.74 and 432.38

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Solution

The fourth proportional to 781.70, 1,078.74 and 432.38 is: 596.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.70 : 1,078.74 = 432.38 : x
  2. Step 2: Convert to fraction form
    781.70/1,078.74 = 432.38/x
  3. Step 3: Cross multiply
    781.70x = 1,078.74 × 432.38
  4. Step 4: Simplify right side
    781.70x = 466,420.21
  5. Step 5: Solve for x
    x = 466,420.21/781.70
  6. Step 6: Final answer
    x = 596.68

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.