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Finding the Fourth Proportional to 664,306.40, 996,459.60 and 439,920.20

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Solution

The fourth proportional to 664,306.40, 996,459.60 and 439,920.20 is: 659,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,306.40 : 996,459.60 = 439,920.20 : x
  2. Step 2: Convert to fraction form
    664,306.40/996,459.60 = 439,920.20/x
  3. Step 3: Cross multiply
    664,306.40x = 996,459.60 × 439,920.20
  4. Step 4: Simplify right side
    664,306.40x = 438,362,706,523.92
  5. Step 5: Solve for x
    x = 438,362,706,523.92/664,306.40
  6. Step 6: Final answer
    x = 659,880.30

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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.