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Finding the Fourth Proportional to 487.56, 731.33 and 140.89

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Solution

The fourth proportional to 487.56, 731.33 and 140.89 is: 211.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.56 : 731.33 = 140.89 : x
  2. Step 2: Convert to fraction form
    487.56/731.33 = 140.89/x
  3. Step 3: Cross multiply
    487.56x = 731.33 × 140.89
  4. Step 4: Simplify right side
    487.56x = 103,037.08
  5. Step 5: Solve for x
    x = 103,037.08/487.56
  6. Step 6: Final answer
    x = 211.33

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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.