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Finding the Fourth Proportional to 104.30, 155.35 and 87.69

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Solution

The fourth proportional to 104.30, 155.35 and 87.69 is: 130.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.30 : 155.35 = 87.69 : x
  2. Step 2: Convert to fraction form
    104.30/155.35 = 87.69/x
  3. Step 3: Cross multiply
    104.30x = 155.35 × 87.69
  4. Step 4: Simplify right side
    104.30x = 13,622.64
  5. Step 5: Solve for x
    x = 13,622.64/104.30
  6. Step 6: Final answer
    x = 130.61

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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.