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Finding the Fourth Proportional to 66.38, 91.67 and 62.55

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Solution

The fourth proportional to 66.38, 91.67 and 62.55 is: 86.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.38 : 91.67 = 62.55 : x
  2. Step 2: Convert to fraction form
    66.38/91.67 = 62.55/x
  3. Step 3: Cross multiply
    66.38x = 91.67 × 62.55
  4. Step 4: Simplify right side
    66.38x = 5,733.65
  5. Step 5: Solve for x
    x = 5,733.65/66.38
  6. Step 6: Final answer
    x = 86.38

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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.