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Finding the Fourth Proportional to 55.24, 82.85 and 20.97

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Solution

The fourth proportional to 55.24, 82.85 and 20.97 is: 31.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.24 : 82.85 = 20.97 : x
  2. Step 2: Convert to fraction form
    55.24/82.85 = 20.97/x
  3. Step 3: Cross multiply
    55.24x = 82.85 × 20.97
  4. Step 4: Simplify right side
    55.24x = 1,737.26
  5. Step 5: Solve for x
    x = 1,737.26/55.24
  6. Step 6: Final answer
    x = 31.45

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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.