Home / 80,712.50-121,069.35-28,121.90

Finding the Fourth Proportional to 80,712.50, 121,069.35 and 28,121.90

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Solution

The fourth proportional to 80,712.50, 121,069.35 and 28,121.90 is: 42,183.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,712.50 : 121,069.35 = 28,121.90 : x
  2. Step 2: Convert to fraction form
    80,712.50/121,069.35 = 28,121.90/x
  3. Step 3: Cross multiply
    80,712.50x = 121,069.35 × 28,121.90
  4. Step 4: Simplify right side
    80,712.50x = 3,404,699,548.42
  5. Step 5: Solve for x
    x = 3,404,699,548.42/80,712.50
  6. Step 6: Final answer
    x = 42,183.05

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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.