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Finding the Fourth Proportional to 55.18, 76.20 and 38.86

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Solution

The fourth proportional to 55.18, 76.20 and 38.86 is: 53.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.18 : 76.20 = 38.86 : x
  2. Step 2: Convert to fraction form
    55.18/76.20 = 38.86/x
  3. Step 3: Cross multiply
    55.18x = 76.20 × 38.86
  4. Step 4: Simplify right side
    55.18x = 2,961.13
  5. Step 5: Solve for x
    x = 2,961.13/55.18
  6. Step 6: Final answer
    x = 53.66

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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.