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Finding the Fourth Proportional to 664,360.40, 996,540.60 and 660,423.80

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Solution

The fourth proportional to 664,360.40, 996,540.60 and 660,423.80 is: 990,635.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,360.40 : 996,540.60 = 660,423.80 : x
  2. Step 2: Convert to fraction form
    664,360.40/996,540.60 = 660,423.80/x
  3. Step 3: Cross multiply
    664,360.40x = 996,540.60 × 660,423.80
  4. Step 4: Simplify right side
    664,360.40x = 658,139,129,906.28
  5. Step 5: Solve for x
    x = 658,139,129,906.28/664,360.40
  6. Step 6: Final answer
    x = 990,635.70

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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.