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Finding the Fourth Proportional to 664,480.80, 996,721.20 and 398,104.20

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Solution

The fourth proportional to 664,480.80, 996,721.20 and 398,104.20 is: 597,156.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,480.80 : 996,721.20 = 398,104.20 : x
  2. Step 2: Convert to fraction form
    664,480.80/996,721.20 = 398,104.20/x
  3. Step 3: Cross multiply
    664,480.80x = 996,721.20 × 398,104.20
  4. Step 4: Simplify right side
    664,480.80x = 396,798,895,949.04
  5. Step 5: Solve for x
    x = 396,798,895,949.04/664,480.80
  6. Step 6: Final answer
    x = 597,156.30

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Half scale
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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.