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Finding the Fourth Proportional to 91,721.80, 137,388.30 and 80,057.80

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Solution

The fourth proportional to 91,721.80, 137,388.30 and 80,057.80 is: 119,917.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,721.80 : 137,388.30 = 80,057.80 : x
  2. Step 2: Convert to fraction form
    91,721.80/137,388.30 = 80,057.80/x
  3. Step 3: Cross multiply
    91,721.80x = 137,388.30 × 80,057.80
  4. Step 4: Simplify right side
    91,721.80x = 10,999,005,043.74
  5. Step 5: Solve for x
    x = 10,999,005,043.74/91,721.80
  6. Step 6: Final answer
    x = 119,917.02

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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.