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Finding the Fourth Proportional to 485,388.20, 728,082.30 and 275,436.20

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Solution

The fourth proportional to 485,388.20, 728,082.30 and 275,436.20 is: 413,154.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,388.20 : 728,082.30 = 275,436.20 : x
  2. Step 2: Convert to fraction form
    485,388.20/728,082.30 = 275,436.20/x
  3. Step 3: Cross multiply
    485,388.20x = 728,082.30 × 275,436.20
  4. Step 4: Simplify right side
    485,388.20x = 200,540,221,999.26
  5. Step 5: Solve for x
    x = 200,540,221,999.26/485,388.20
  6. Step 6: Final answer
    x = 413,154.30

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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.