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Finding the Fourth Proportional to 104.80, 155.96 and 103.72

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Solution

The fourth proportional to 104.80, 155.96 and 103.72 is: 154.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.80 : 155.96 = 103.72 : x
  2. Step 2: Convert to fraction form
    104.80/155.96 = 103.72/x
  3. Step 3: Cross multiply
    104.80x = 155.96 × 103.72
  4. Step 4: Simplify right side
    104.80x = 16,176.17
  5. Step 5: Solve for x
    x = 16,176.17/104.80
  6. Step 6: Final answer
    x = 154.35

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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.