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Finding the Fourth Proportional to 103.31, 154.28 and 91.97

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Solution

The fourth proportional to 103.31, 154.28 and 91.97 is: 137.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.31 : 154.28 = 91.97 : x
  2. Step 2: Convert to fraction form
    103.31/154.28 = 91.97/x
  3. Step 3: Cross multiply
    103.31x = 154.28 × 91.97
  4. Step 4: Simplify right side
    103.31x = 14,188.91
  5. Step 5: Solve for x
    x = 14,188.91/103.31
  6. Step 6: Final answer
    x = 137.34

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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.