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Finding the Fourth Proportional to 103.91, 155.65 and 83.38

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Solution

The fourth proportional to 103.91, 155.65 and 83.38 is: 124.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.91 : 155.65 = 83.38 : x
  2. Step 2: Convert to fraction form
    103.91/155.65 = 83.38/x
  3. Step 3: Cross multiply
    103.91x = 155.65 × 83.38
  4. Step 4: Simplify right side
    103.91x = 12,976.90
  5. Step 5: Solve for x
    x = 12,976.90/103.91
  6. Step 6: Final answer
    x = 124.89

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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.