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Finding the Fourth Proportional to 103.71, 155.30 and 92.69

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Solution

The fourth proportional to 103.71, 155.30 and 92.69 is: 138.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.71 : 155.30 = 92.69 : x
  2. Step 2: Convert to fraction form
    103.71/155.30 = 92.69/x
  3. Step 3: Cross multiply
    103.71x = 155.30 × 92.69
  4. Step 4: Simplify right side
    103.71x = 14,394.21
  5. Step 5: Solve for x
    x = 14,394.21/103.71
  6. Step 6: Final answer
    x = 138.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.