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Finding the Fourth Proportional to 104.08, 155.26 and 87.07

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Solution

The fourth proportional to 104.08, 155.26 and 87.07 is: 129.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.08 : 155.26 = 87.07 : x
  2. Step 2: Convert to fraction form
    104.08/155.26 = 87.07/x
  3. Step 3: Cross multiply
    104.08x = 155.26 × 87.07
  4. Step 4: Simplify right side
    104.08x = 13,517.28
  5. Step 5: Solve for x
    x = 13,517.28/104.08
  6. Step 6: Final answer
    x = 129.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.