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Finding the Fourth Proportional to 121,570.80, 167,843.52 and 78,572.76

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Solution

The fourth proportional to 121,570.80, 167,843.52 and 78,572.76 is: 108,479.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,570.80 : 167,843.52 = 78,572.76 : x
  2. Step 2: Convert to fraction form
    121,570.80/167,843.52 = 78,572.76/x
  3. Step 3: Cross multiply
    121,570.80x = 167,843.52 × 78,572.76
  4. Step 4: Simplify right side
    121,570.80x = 13,187,928,614.52
  5. Step 5: Solve for x
    x = 13,187,928,614.52/121,570.80
  6. Step 6: Final answer
    x = 108,479.41

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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.