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Finding the Fourth Proportional to 66.81, 99.65 and 62.57

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Solution

The fourth proportional to 66.81, 99.65 and 62.57 is: 93.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.81 : 99.65 = 62.57 : x
  2. Step 2: Convert to fraction form
    66.81/99.65 = 62.57/x
  3. Step 3: Cross multiply
    66.81x = 99.65 × 62.57
  4. Step 4: Simplify right side
    66.81x = 6,234.29
  5. Step 5: Solve for x
    x = 6,234.29/66.81
  6. Step 6: Final answer
    x = 93.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.