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Finding the Fourth Proportional to 487.66, 731.40 and 140.92

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Solution

The fourth proportional to 487.66, 731.40 and 140.92 is: 211.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.66 : 731.40 = 140.92 : x
  2. Step 2: Convert to fraction form
    487.66/731.40 = 140.92/x
  3. Step 3: Cross multiply
    487.66x = 731.40 × 140.92
  4. Step 4: Simplify right side
    487.66x = 103,068.89
  5. Step 5: Solve for x
    x = 103,068.89/487.66
  6. Step 6: Final answer
    x = 211.35

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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.