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Finding the Fourth Proportional to 113.13, 155.89 and 86.90

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Solution

The fourth proportional to 113.13, 155.89 and 86.90 is: 119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.13 : 155.89 = 86.90 : x
  2. Step 2: Convert to fraction form
    113.13/155.89 = 86.90/x
  3. Step 3: Cross multiply
    113.13x = 155.89 × 86.90
  4. Step 4: Simplify right side
    113.13x = 13,546.84
  5. Step 5: Solve for x
    x = 13,546.84/113.13
  6. Step 6: Final answer
    x = 119.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.