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Finding the Fourth Proportional to 664,118.80, 996,178.20 and 427,728.40

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Solution

The fourth proportional to 664,118.80, 996,178.20 and 427,728.40 is: 641,592.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,118.80 : 996,178.20 = 427,728.40 : x
  2. Step 2: Convert to fraction form
    664,118.80/996,178.20 = 427,728.40/x
  3. Step 3: Cross multiply
    664,118.80x = 996,178.20 × 427,728.40
  4. Step 4: Simplify right side
    664,118.80x = 426,093,707,600.88
  5. Step 5: Solve for x
    x = 426,093,707,600.88/664,118.80
  6. Step 6: Final answer
    x = 641,592.60

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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.