Home / 81,332.20-121,998.30-72,875.80

Finding the Fourth Proportional to 81,332.20, 121,998.30 and 72,875.80

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Solution

The fourth proportional to 81,332.20, 121,998.30 and 72,875.80 is: 109,313.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,332.20 : 121,998.30 = 72,875.80 : x
  2. Step 2: Convert to fraction form
    81,332.20/121,998.30 = 72,875.80/x
  3. Step 3: Cross multiply
    81,332.20x = 121,998.30 × 72,875.80
  4. Step 4: Simplify right side
    81,332.20x = 8,890,723,711.14
  5. Step 5: Solve for x
    x = 8,890,723,711.14/81,332.20
  6. Step 6: Final answer
    x = 109,313.70

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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.