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Finding the Fourth Proportional to 781.92, 1,078.92 and 471.42

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Solution

The fourth proportional to 781.92, 1,078.92 and 471.42 is: 650.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.92 : 1,078.92 = 471.42 : x
  2. Step 2: Convert to fraction form
    781.92/1,078.92 = 471.42/x
  3. Step 3: Cross multiply
    781.92x = 1,078.92 × 471.42
  4. Step 4: Simplify right side
    781.92x = 508,624.47
  5. Step 5: Solve for x
    x = 508,624.47/781.92
  6. Step 6: Final answer
    x = 650.48

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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.