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Finding the Fourth Proportional to 1,066.92, 1,472.80 and 831.50

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Solution

The fourth proportional to 1,066.92, 1,472.80 and 831.50 is: 1,147.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,066.92 : 1,472.80 = 831.50 : x
  2. Step 2: Convert to fraction form
    1,066.92/1,472.80 = 831.50/x
  3. Step 3: Cross multiply
    1,066.92x = 1,472.80 × 831.50
  4. Step 4: Simplify right side
    1,066.92x = 1,224,633.20
  5. Step 5: Solve for x
    x = 1,224,633.20/1,066.92
  6. Step 6: Final answer
    x = 1,147.82

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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.