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Finding the Fourth Proportional to 485,874.20, 728,811.30 and 420,920.30

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Solution

The fourth proportional to 485,874.20, 728,811.30 and 420,920.30 is: 631,380.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,874.20 : 728,811.30 = 420,920.30 : x
  2. Step 2: Convert to fraction form
    485,874.20/728,811.30 = 420,920.30/x
  3. Step 3: Cross multiply
    485,874.20x = 728,811.30 × 420,920.30
  4. Step 4: Simplify right side
    485,874.20x = 306,771,471,039.39
  5. Step 5: Solve for x
    x = 306,771,471,039.39/485,874.20
  6. Step 6: Final answer
    x = 631,380.45

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Similar ratio
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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.