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Finding the Fourth Proportional to 664,891.20, 997,336.80 and 215,611.20

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Solution

The fourth proportional to 664,891.20, 997,336.80 and 215,611.20 is: 323,416.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,891.20 : 997,336.80 = 215,611.20 : x
  2. Step 2: Convert to fraction form
    664,891.20/997,336.80 = 215,611.20/x
  3. Step 3: Cross multiply
    664,891.20x = 997,336.80 × 215,611.20
  4. Step 4: Simplify right side
    664,891.20x = 215,036,984,252.16
  5. Step 5: Solve for x
    x = 215,036,984,252.16/664,891.20
  6. Step 6: Final answer
    x = 323,416.80

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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.