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Finding the Fourth Proportional to 123.31, 171.02 and 113.06

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Solution

The fourth proportional to 123.31, 171.02 and 113.06 is: 156.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.31 : 171.02 = 113.06 : x
  2. Step 2: Convert to fraction form
    123.31/171.02 = 113.06/x
  3. Step 3: Cross multiply
    123.31x = 171.02 × 113.06
  4. Step 4: Simplify right side
    123.31x = 19,335.52
  5. Step 5: Solve for x
    x = 19,335.52/123.31
  6. Step 6: Final answer
    x = 156.80

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.