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Finding the Fourth Proportional to 121,311.20, 181,966.80 and 108,480.80

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Solution

The fourth proportional to 121,311.20, 181,966.80 and 108,480.80 is: 162,721.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,311.20 : 181,966.80 = 108,480.80 : x
  2. Step 2: Convert to fraction form
    121,311.20/181,966.80 = 108,480.80/x
  3. Step 3: Cross multiply
    121,311.20x = 181,966.80 × 108,480.80
  4. Step 4: Simplify right side
    121,311.20x = 19,739,904,037.44
  5. Step 5: Solve for x
    x = 19,739,904,037.44/121,311.20
  6. Step 6: Final answer
    x = 162,721.20

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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.