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Finding the Fourth Proportional to 321,387.40, 482,081.10 and 269,288.20

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Solution

The fourth proportional to 321,387.40, 482,081.10 and 269,288.20 is: 403,932.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,387.40 : 482,081.10 = 269,288.20 : x
  2. Step 2: Convert to fraction form
    321,387.40/482,081.10 = 269,288.20/x
  3. Step 3: Cross multiply
    321,387.40x = 482,081.10 × 269,288.20
  4. Step 4: Simplify right side
    321,387.40x = 129,818,751,673.02
  5. Step 5: Solve for x
    x = 129,818,751,673.02/321,387.40
  6. Step 6: Final answer
    x = 403,932.30

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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.