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Finding the Fourth Proportional to 115.39, 158.84 and 103.73

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Solution

The fourth proportional to 115.39, 158.84 and 103.73 is: 142.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.39 : 158.84 = 103.73 : x
  2. Step 2: Convert to fraction form
    115.39/158.84 = 103.73/x
  3. Step 3: Cross multiply
    115.39x = 158.84 × 103.73
  4. Step 4: Simplify right side
    115.39x = 16,476.81
  5. Step 5: Solve for x
    x = 16,476.81/115.39
  6. Step 6: Final answer
    x = 142.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.