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Finding the Fourth Proportional to 104.19, 155.87 and 87.08

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Solution

The fourth proportional to 104.19, 155.87 and 87.08 is: 130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.19 : 155.87 = 87.08 : x
  2. Step 2: Convert to fraction form
    104.19/155.87 = 87.08/x
  3. Step 3: Cross multiply
    104.19x = 155.87 × 87.08
  4. Step 4: Simplify right side
    104.19x = 13,572.76
  5. Step 5: Solve for x
    x = 13,572.76/104.19
  6. Step 6: Final answer
    x = 130.27

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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.