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Finding the Fourth Proportional to 121,990.80, 182,986.20 and 99,829.20

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Solution

The fourth proportional to 121,990.80, 182,986.20 and 99,829.20 is: 149,743.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,990.80 : 182,986.20 = 99,829.20 : x
  2. Step 2: Convert to fraction form
    121,990.80/182,986.20 = 99,829.20/x
  3. Step 3: Cross multiply
    121,990.80x = 182,986.20 × 99,829.20
  4. Step 4: Simplify right side
    121,990.80x = 18,267,365,957.04
  5. Step 5: Solve for x
    x = 18,267,365,957.04/121,990.80
  6. Step 6: Final answer
    x = 149,743.80

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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.