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Finding the Fourth Proportional to 487.42, 731.14 and 140.74

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Solution

The fourth proportional to 487.42, 731.14 and 140.74 is: 211.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.42 : 731.14 = 140.74 : x
  2. Step 2: Convert to fraction form
    487.42/731.14 = 140.74/x
  3. Step 3: Cross multiply
    487.42x = 731.14 × 140.74
  4. Step 4: Simplify right side
    487.42x = 102,900.64
  5. Step 5: Solve for x
    x = 102,900.64/487.42
  6. Step 6: Final answer
    x = 211.11

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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.