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Finding the Fourth Proportional to 104.05, 155.91 and 86.92

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Solution

The fourth proportional to 104.05, 155.91 and 86.92 is: 130.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.05 : 155.91 = 86.92 : x
  2. Step 2: Convert to fraction form
    104.05/155.91 = 86.92/x
  3. Step 3: Cross multiply
    104.05x = 155.91 × 86.92
  4. Step 4: Simplify right side
    104.05x = 13,551.31
  5. Step 5: Solve for x
    x = 13,551.31/104.05
  6. Step 6: Final answer
    x = 130.24

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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.