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Finding the Fourth Proportional to 66.72, 100.14 and 59.89

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Solution

The fourth proportional to 66.72, 100.14 and 59.89 is: 89.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.72 : 100.14 = 59.89 : x
  2. Step 2: Convert to fraction form
    66.72/100.14 = 59.89/x
  3. Step 3: Cross multiply
    66.72x = 100.14 × 59.89
  4. Step 4: Simplify right side
    66.72x = 5,997.10
  5. Step 5: Solve for x
    x = 5,997.10/66.72
  6. Step 6: Final answer
    x = 89.88

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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.