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Finding the Fourth Proportional to 104.09, 155.31 and 88.70

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Solution

The fourth proportional to 104.09, 155.31 and 88.70 is: 132.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.09 : 155.31 = 88.70 : x
  2. Step 2: Convert to fraction form
    104.09/155.31 = 88.70/x
  3. Step 3: Cross multiply
    104.09x = 155.31 × 88.70
  4. Step 4: Simplify right side
    104.09x = 13,775.55
  5. Step 5: Solve for x
    x = 13,775.55/104.09
  6. Step 6: Final answer
    x = 132.34

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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.