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Finding the Fourth Proportional to 121,425.57, 167,491.53 and 78,388.52

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Solution

The fourth proportional to 121,425.57, 167,491.53 and 78,388.52 is: 108,127.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,425.57 : 167,491.53 = 78,388.52 : x
  2. Step 2: Convert to fraction form
    121,425.57/167,491.53 = 78,388.52/x
  3. Step 3: Cross multiply
    121,425.57x = 167,491.53 × 78,388.52
  4. Step 4: Simplify right side
    121,425.57x = 13,129,412,311.78
  5. Step 5: Solve for x
    x = 13,129,412,311.78/121,425.57
  6. Step 6: Final answer
    x = 108,127.24

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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.