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Finding the Fourth Proportional to 103.17, 154.85 and 74.32

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Solution

The fourth proportional to 103.17, 154.85 and 74.32 is: 111.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.17 : 154.85 = 74.32 : x
  2. Step 2: Convert to fraction form
    103.17/154.85 = 74.32/x
  3. Step 3: Cross multiply
    103.17x = 154.85 × 74.32
  4. Step 4: Simplify right side
    103.17x = 11,508.45
  5. Step 5: Solve for x
    x = 11,508.45/103.17
  6. Step 6: Final answer
    x = 111.55

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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.