Home / 80,864.20-121,442.10-78,239.80

Finding the Fourth Proportional to 80,864.20, 121,442.10 and 78,239.80

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Solution

The fourth proportional to 80,864.20, 121,442.10 and 78,239.80 is: 117,500.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,864.20 : 121,442.10 = 78,239.80 : x
  2. Step 2: Convert to fraction form
    80,864.20/121,442.10 = 78,239.80/x
  3. Step 3: Cross multiply
    80,864.20x = 121,442.10 × 78,239.80
  4. Step 4: Simplify right side
    80,864.20x = 9,501,605,615.58
  5. Step 5: Solve for x
    x = 9,501,605,615.58/80,864.20
  6. Step 6: Final answer
    x = 117,500.77

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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.