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Finding the Fourth Proportional to 67,405.80, 101,108.70 and 54,721.20

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Solution

The fourth proportional to 67,405.80, 101,108.70 and 54,721.20 is: 82,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,405.80 : 101,108.70 = 54,721.20 : x
  2. Step 2: Convert to fraction form
    67,405.80/101,108.70 = 54,721.20/x
  3. Step 3: Cross multiply
    67,405.80x = 101,108.70 × 54,721.20
  4. Step 4: Simplify right side
    67,405.80x = 5,532,789,394.44
  5. Step 5: Solve for x
    x = 5,532,789,394.44/67,405.80
  6. Step 6: Final answer
    x = 82,081.80

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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.