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Finding the Fourth Proportional to 55.68, 76.82 and 31.11

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Solution

The fourth proportional to 55.68, 76.82 and 31.11 is: 42.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.68 : 76.82 = 31.11 : x
  2. Step 2: Convert to fraction form
    55.68/76.82 = 31.11/x
  3. Step 3: Cross multiply
    55.68x = 76.82 × 31.11
  4. Step 4: Simplify right side
    55.68x = 2,389.43
  5. Step 5: Solve for x
    x = 2,389.43/55.68
  6. Step 6: Final answer
    x = 42.92

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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.