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Finding the Fourth Proportional to 664,549.20, 996,823.80 and 399,128.40

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Solution

The fourth proportional to 664,549.20, 996,823.80 and 399,128.40 is: 598,692.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,549.20 : 996,823.80 = 399,128.40 : x
  2. Step 2: Convert to fraction form
    664,549.20/996,823.80 = 399,128.40/x
  3. Step 3: Cross multiply
    664,549.20x = 996,823.80 × 399,128.40
  4. Step 4: Simplify right side
    664,549.20x = 397,860,688,375.92
  5. Step 5: Solve for x
    x = 397,860,688,375.92/664,549.20
  6. Step 6: Final answer
    x = 598,692.60

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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.