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Finding the Fourth Proportional to 103.05, 154.45 and 42.20

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Solution

The fourth proportional to 103.05, 154.45 and 42.20 is: 63.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.05 : 154.45 = 42.20 : x
  2. Step 2: Convert to fraction form
    103.05/154.45 = 42.20/x
  3. Step 3: Cross multiply
    103.05x = 154.45 × 42.20
  4. Step 4: Simplify right side
    103.05x = 6,516.91
  5. Step 5: Solve for x
    x = 6,516.91/103.05
  6. Step 6: Final answer
    x = 63.24

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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.