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Finding the Fourth Proportional to 664,295.40, 996,443.10 and 439,909.20

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Solution

The fourth proportional to 664,295.40, 996,443.10 and 439,909.20 is: 659,863.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,295.40 : 996,443.10 = 439,909.20 : x
  2. Step 2: Convert to fraction form
    664,295.40/996,443.10 = 439,909.20/x
  3. Step 3: Cross multiply
    664,295.40x = 996,443.10 × 439,909.20
  4. Step 4: Simplify right side
    664,295.40x = 438,344,486,966.52
  5. Step 5: Solve for x
    x = 438,344,486,966.52/664,295.40
  6. Step 6: Final answer
    x = 659,863.80

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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.