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Finding the Fourth Proportional to 781.54, 1,078.51 and 432.23

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Solution

The fourth proportional to 781.54, 1,078.51 and 432.23 is: 596.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.54 : 1,078.51 = 432.23 : x
  2. Step 2: Convert to fraction form
    781.54/1,078.51 = 432.23/x
  3. Step 3: Cross multiply
    781.54x = 1,078.51 × 432.23
  4. Step 4: Simplify right side
    781.54x = 466,164.38
  5. Step 5: Solve for x
    x = 466,164.38/781.54
  6. Step 6: Final answer
    x = 596.47

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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.