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Finding the Fourth Proportional to 121,041.60, 181,562.40 and 74,320.80

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Solution

The fourth proportional to 121,041.60, 181,562.40 and 74,320.80 is: 111,481.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,041.60 : 181,562.40 = 74,320.80 : x
  2. Step 2: Convert to fraction form
    121,041.60/181,562.40 = 74,320.80/x
  3. Step 3: Cross multiply
    121,041.60x = 181,562.40 × 74,320.80
  4. Step 4: Simplify right side
    121,041.60x = 13,493,862,817.92
  5. Step 5: Solve for x
    x = 13,493,862,817.92/121,041.60
  6. Step 6: Final answer
    x = 111,481.20

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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.