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Finding the Fourth Proportional to 66.72, 92.06 and 39.11

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Solution

The fourth proportional to 66.72, 92.06 and 39.11 is: 53.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.72 : 92.06 = 39.11 : x
  2. Step 2: Convert to fraction form
    66.72/92.06 = 39.11/x
  3. Step 3: Cross multiply
    66.72x = 92.06 × 39.11
  4. Step 4: Simplify right side
    66.72x = 3,600.18
  5. Step 5: Solve for x
    x = 3,600.18/66.72
  6. Step 6: Final answer
    x = 53.96

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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.