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Finding the Fourth Proportional to 104.40, 155.51 and 103.91

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Solution

The fourth proportional to 104.40, 155.51 and 103.91 is: 154.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.40 : 155.51 = 103.91 : x
  2. Step 2: Convert to fraction form
    104.40/155.51 = 103.91/x
  3. Step 3: Cross multiply
    104.40x = 155.51 × 103.91
  4. Step 4: Simplify right side
    104.40x = 16,158.53
  5. Step 5: Solve for x
    x = 16,158.53/104.40
  6. Step 6: Final answer
    x = 154.78

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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.