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Finding the Fourth Proportional to 60.68, 83.72 and 39.92

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Solution

The fourth proportional to 60.68, 83.72 and 39.92 is: 55.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.68 : 83.72 = 39.92 : x
  2. Step 2: Convert to fraction form
    60.68/83.72 = 39.92/x
  3. Step 3: Cross multiply
    60.68x = 83.72 × 39.92
  4. Step 4: Simplify right side
    60.68x = 3,342.10
  5. Step 5: Solve for x
    x = 3,342.10/60.68
  6. Step 6: Final answer
    x = 55.08

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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.