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Finding the Fourth Proportional to 67,228.13, 100,842.20 and 20,481

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Solution

The fourth proportional to 67,228.13, 100,842.20 and 20,481 is: 30,721.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,228.13 : 100,842.20 = 20,481 : x
  2. Step 2: Convert to fraction form
    67,228.13/100,842.20 = 20,481/x
  3. Step 3: Cross multiply
    67,228.13x = 100,842.20 × 20,481
  4. Step 4: Simplify right side
    67,228.13x = 2,065,348,995.80
  5. Step 5: Solve for x
    x = 2,065,348,995.80/67,228.13
  6. Step 6: Final answer
    x = 30,721.50

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Double scale
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Similar ratio
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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.