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Finding the Fourth Proportional to 104.31, 155.57 and 102.39

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Solution

The fourth proportional to 104.31, 155.57 and 102.39 is: 152.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.31 : 155.57 = 102.39 : x
  2. Step 2: Convert to fraction form
    104.31/155.57 = 102.39/x
  3. Step 3: Cross multiply
    104.31x = 155.57 × 102.39
  4. Step 4: Simplify right side
    104.31x = 15,928.16
  5. Step 5: Solve for x
    x = 15,928.16/104.31
  6. Step 6: Final answer
    x = 152.70

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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.