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Finding the Fourth Proportional to 83,990.80, 125,986.20 and 42,000.40

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Solution

The fourth proportional to 83,990.80, 125,986.20 and 42,000.40 is: 63,000.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,990.80 : 125,986.20 = 42,000.40 : x
  2. Step 2: Convert to fraction form
    83,990.80/125,986.20 = 42,000.40/x
  3. Step 3: Cross multiply
    83,990.80x = 125,986.20 × 42,000.40
  4. Step 4: Simplify right side
    83,990.80x = 5,291,470,794.48
  5. Step 5: Solve for x
    x = 5,291,470,794.48/83,990.80
  6. Step 6: Final answer
    x = 63,000.60

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Similar ratio
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1.5x scale

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.