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Finding the Fourth Proportional to 664,567.20, 996,850.80 and 399,146.40

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Solution

The fourth proportional to 664,567.20, 996,850.80 and 399,146.40 is: 598,719.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,567.20 : 996,850.80 = 399,146.40 : x
  2. Step 2: Convert to fraction form
    664,567.20/996,850.80 = 399,146.40/x
  3. Step 3: Cross multiply
    664,567.20x = 996,850.80 × 399,146.40
  4. Step 4: Simplify right side
    664,567.20x = 397,889,408,157.12
  5. Step 5: Solve for x
    x = 397,889,408,157.12/664,567.20
  6. Step 6: Final answer
    x = 598,719.60

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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.