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Finding the Fourth Proportional to 664,343.40, 996,515.10 and 439,957.20

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Solution

The fourth proportional to 664,343.40, 996,515.10 and 439,957.20 is: 659,935.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,343.40 : 996,515.10 = 439,957.20 : x
  2. Step 2: Convert to fraction form
    664,343.40/996,515.10 = 439,957.20/x
  3. Step 3: Cross multiply
    664,343.40x = 996,515.10 × 439,957.20
  4. Step 4: Simplify right side
    664,343.40x = 438,423,993,153.72
  5. Step 5: Solve for x
    x = 438,423,993,153.72/664,343.40
  6. Step 6: Final answer
    x = 659,935.80

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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.