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Finding the Fourth Proportional to 55.73, 76.92 and 31.18

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Solution

The fourth proportional to 55.73, 76.92 and 31.18 is: 43.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.73 : 76.92 = 31.18 : x
  2. Step 2: Convert to fraction form
    55.73/76.92 = 31.18/x
  3. Step 3: Cross multiply
    55.73x = 76.92 × 31.18
  4. Step 4: Simplify right side
    55.73x = 2,397.98
  5. Step 5: Solve for x
    x = 2,397.98/55.73
  6. Step 6: Final answer
    x = 43.03

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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.