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Finding the Fourth Proportional to 126.20, 174.30 and 89.43

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Solution

The fourth proportional to 126.20, 174.30 and 89.43 is: 123.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.20 : 174.30 = 89.43 : x
  2. Step 2: Convert to fraction form
    126.20/174.30 = 89.43/x
  3. Step 3: Cross multiply
    126.20x = 174.30 × 89.43
  4. Step 4: Simplify right side
    126.20x = 15,587.65
  5. Step 5: Solve for x
    x = 15,587.65/126.20
  6. Step 6: Final answer
    x = 123.52

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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.