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Finding the Fourth Proportional to 66.12, 91.17 and 59.58

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Solution

The fourth proportional to 66.12, 91.17 and 59.58 is: 82.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.12 : 91.17 = 59.58 : x
  2. Step 2: Convert to fraction form
    66.12/91.17 = 59.58/x
  3. Step 3: Cross multiply
    66.12x = 91.17 × 59.58
  4. Step 4: Simplify right side
    66.12x = 5,431.91
  5. Step 5: Solve for x
    x = 5,431.91/66.12
  6. Step 6: Final answer
    x = 82.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.