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Finding the Fourth Proportional to 66.91, 92.31 and 39.27

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Solution

The fourth proportional to 66.91, 92.31 and 39.27 is: 54.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.91 : 92.31 = 39.27 : x
  2. Step 2: Convert to fraction form
    66.91/92.31 = 39.27/x
  3. Step 3: Cross multiply
    66.91x = 92.31 × 39.27
  4. Step 4: Simplify right side
    66.91x = 3,625.01
  5. Step 5: Solve for x
    x = 3,625.01/66.91
  6. Step 6: Final answer
    x = 54.18

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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.