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Finding the Fourth Proportional to 81,253.20, 121,879.80 and 72,440.40

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Solution

The fourth proportional to 81,253.20, 121,879.80 and 72,440.40 is: 108,660.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,253.20 : 121,879.80 = 72,440.40 : x
  2. Step 2: Convert to fraction form
    81,253.20/121,879.80 = 72,440.40/x
  3. Step 3: Cross multiply
    81,253.20x = 121,879.80 × 72,440.40
  4. Step 4: Simplify right side
    81,253.20x = 8,829,021,463.92
  5. Step 5: Solve for x
    x = 8,829,021,463.92/81,253.20
  6. Step 6: Final answer
    x = 108,660.60

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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.