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Finding the Fourth Proportional to 102.98, 154.52 and 42.12

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Solution

The fourth proportional to 102.98, 154.52 and 42.12 is: 63.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.98 : 154.52 = 42.12 : x
  2. Step 2: Convert to fraction form
    102.98/154.52 = 42.12/x
  3. Step 3: Cross multiply
    102.98x = 154.52 × 42.12
  4. Step 4: Simplify right side
    102.98x = 6,508.17
  5. Step 5: Solve for x
    x = 6,508.17/102.98
  6. Step 6: Final answer
    x = 63.20

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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.