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Finding the Fourth Proportional to 681.87, 1,023.42 and 476.61

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Solution

The fourth proportional to 681.87, 1,023.42 and 476.61 is: 715.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.87 : 1,023.42 = 476.61 : x
  2. Step 2: Convert to fraction form
    681.87/1,023.42 = 476.61/x
  3. Step 3: Cross multiply
    681.87x = 1,023.42 × 476.61
  4. Step 4: Simplify right side
    681.87x = 487,772.21
  5. Step 5: Solve for x
    x = 487,772.21/681.87
  6. Step 6: Final answer
    x = 715.34

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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.