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Finding the Fourth Proportional to 66.31, 91.92 and 62.84

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Solution

The fourth proportional to 66.31, 91.92 and 62.84 is: 87.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.31 : 91.92 = 62.84 : x
  2. Step 2: Convert to fraction form
    66.31/91.92 = 62.84/x
  3. Step 3: Cross multiply
    66.31x = 91.92 × 62.84
  4. Step 4: Simplify right side
    66.31x = 5,775.79
  5. Step 5: Solve for x
    x = 5,775.79/66.31
  6. Step 6: Final answer
    x = 87.11

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.