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Finding the Fourth Proportional to 55.72, 76.72 and 42.76

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Solution

The fourth proportional to 55.72, 76.72 and 42.76 is: 58.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.72 : 76.72 = 42.76 : x
  2. Step 2: Convert to fraction form
    55.72/76.72 = 42.76/x
  3. Step 3: Cross multiply
    55.72x = 76.72 × 42.76
  4. Step 4: Simplify right side
    55.72x = 3,280.55
  5. Step 5: Solve for x
    x = 3,280.55/55.72
  6. Step 6: Final answer
    x = 58.88

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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.