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Finding the Fourth Proportional to 82.38, 123.57 and 21.51

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Solution

The fourth proportional to 82.38, 123.57 and 21.51 is: 32.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.38 : 123.57 = 21.51 : x
  2. Step 2: Convert to fraction form
    82.38/123.57 = 21.51/x
  3. Step 3: Cross multiply
    82.38x = 123.57 × 21.51
  4. Step 4: Simplify right side
    82.38x = 2,658.30
  5. Step 5: Solve for x
    x = 2,658.30/82.38
  6. Step 6: Final answer
    x = 32.27

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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.