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Finding the Fourth Proportional to 661,321.62, 991,960.56 and 287,344.62

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Solution

The fourth proportional to 661,321.62, 991,960.56 and 287,344.62 is: 431,007.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,321.62 : 991,960.56 = 287,344.62 : x
  2. Step 2: Convert to fraction form
    661,321.62/991,960.56 = 287,344.62/x
  3. Step 3: Cross multiply
    661,321.62x = 991,960.56 × 287,344.62
  4. Step 4: Simplify right side
    661,321.62x = 285,034,530,168.19
  5. Step 5: Solve for x
    x = 285,034,530,168.19/661,321.62
  6. Step 6: Final answer
    x = 431,007.43

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Double scale
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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.