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Finding the Fourth Proportional to 55.31, 82.88 and 53.66

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Solution

The fourth proportional to 55.31, 82.88 and 53.66 is: 80.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.31 : 82.88 = 53.66 : x
  2. Step 2: Convert to fraction form
    55.31/82.88 = 53.66/x
  3. Step 3: Cross multiply
    55.31x = 82.88 × 53.66
  4. Step 4: Simplify right side
    55.31x = 4,447.28
  5. Step 5: Solve for x
    x = 4,447.28/55.31
  6. Step 6: Final answer
    x = 80.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.