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Finding the Fourth Proportional to 55.68, 76.92 and 42.72

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Solution

The fourth proportional to 55.68, 76.92 and 42.72 is: 59.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.68 : 76.92 = 42.72 : x
  2. Step 2: Convert to fraction form
    55.68/76.92 = 42.72/x
  3. Step 3: Cross multiply
    55.68x = 76.92 × 42.72
  4. Step 4: Simplify right side
    55.68x = 3,286.02
  5. Step 5: Solve for x
    x = 3,286.02/55.68
  6. Step 6: Final answer
    x = 59.02

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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.