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Finding the Fourth Proportional to 664,972.80, 997,459.20 and 399,033.60

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Solution

The fourth proportional to 664,972.80, 997,459.20 and 399,033.60 is: 598,550.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,972.80 : 997,459.20 = 399,033.60 : x
  2. Step 2: Convert to fraction form
    664,972.80/997,459.20 = 399,033.60/x
  3. Step 3: Cross multiply
    664,972.80x = 997,459.20 × 399,033.60
  4. Step 4: Simplify right side
    664,972.80x = 398,019,735,429.12
  5. Step 5: Solve for x
    x = 398,019,735,429.12/664,972.80
  6. Step 6: Final answer
    x = 598,550.40

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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.