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Finding the Fourth Proportional to 123.90, 171.84 and 113.10

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Solution

The fourth proportional to 123.90, 171.84 and 113.10 is: 156.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.90 : 171.84 = 113.10 : x
  2. Step 2: Convert to fraction form
    123.90/171.84 = 113.10/x
  3. Step 3: Cross multiply
    123.90x = 171.84 × 113.10
  4. Step 4: Simplify right side
    123.90x = 19,435.10
  5. Step 5: Solve for x
    x = 19,435.10/123.90
  6. Step 6: Final answer
    x = 156.86

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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.