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Finding the Fourth Proportional to 443,321.70, 664,982.55 and 256,236.90

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Solution

The fourth proportional to 443,321.70, 664,982.55 and 256,236.90 is: 384,355.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    443,321.70 : 664,982.55 = 256,236.90 : x
  2. Step 2: Convert to fraction form
    443,321.70/664,982.55 = 256,236.90/x
  3. Step 3: Cross multiply
    443,321.70x = 664,982.55 × 256,236.90
  4. Step 4: Simplify right side
    443,321.70x = 170,393,067,166.10
  5. Step 5: Solve for x
    x = 170,393,067,166.10/443,321.70
  6. Step 6: Final answer
    x = 384,355.35

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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.