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Finding the Fourth Proportional to 103.28, 154.91 and 31.13

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Solution

The fourth proportional to 103.28, 154.91 and 31.13 is: 46.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.28 : 154.91 = 31.13 : x
  2. Step 2: Convert to fraction form
    103.28/154.91 = 31.13/x
  3. Step 3: Cross multiply
    103.28x = 154.91 × 31.13
  4. Step 4: Simplify right side
    103.28x = 4,821.65
  5. Step 5: Solve for x
    x = 4,821.65/103.28
  6. Step 6: Final answer
    x = 46.68

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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.