Home / 81,020.66-121,356.03-79,037.78

Finding the Fourth Proportional to 81,020.66, 121,356.03 and 79,037.78

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Solution

The fourth proportional to 81,020.66, 121,356.03 and 79,037.78 is: 118,385.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,020.66 : 121,356.03 = 79,037.78 : x
  2. Step 2: Convert to fraction form
    81,020.66/121,356.03 = 79,037.78/x
  3. Step 3: Cross multiply
    81,020.66x = 121,356.03 × 79,037.78
  4. Step 4: Simplify right side
    81,020.66x = 9,591,711,200.81
  5. Step 5: Solve for x
    x = 9,591,711,200.81/81,020.66
  6. Step 6: Final answer
    x = 118,385.99

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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.