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Finding the Fourth Proportional to 66.29, 91.40 and 61.43

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Solution

The fourth proportional to 66.29, 91.40 and 61.43 is: 84.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.29 : 91.40 = 61.43 : x
  2. Step 2: Convert to fraction form
    66.29/91.40 = 61.43/x
  3. Step 3: Cross multiply
    66.29x = 91.40 × 61.43
  4. Step 4: Simplify right side
    66.29x = 5,613.94
  5. Step 5: Solve for x
    x = 5,613.94/66.29
  6. Step 6: Final answer
    x = 84.69

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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.