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Finding the Fourth Proportional to 169.61, 234.05 and 103.20

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Solution

The fourth proportional to 169.61, 234.05 and 103.20 is: 142.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.61 : 234.05 = 103.20 : x
  2. Step 2: Convert to fraction form
    169.61/234.05 = 103.20/x
  3. Step 3: Cross multiply
    169.61x = 234.05 × 103.20
  4. Step 4: Simplify right side
    169.61x = 24,154.22
  5. Step 5: Solve for x
    x = 24,154.22/169.61
  6. Step 6: Final answer
    x = 142.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.