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Finding the Fourth Proportional to 485,747.60, 728,621.40 and 299,123.60

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Solution

The fourth proportional to 485,747.60, 728,621.40 and 299,123.60 is: 448,685.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,747.60 : 728,621.40 = 299,123.60 : x
  2. Step 2: Convert to fraction form
    485,747.60/728,621.40 = 299,123.60/x
  3. Step 3: Cross multiply
    485,747.60x = 728,621.40 × 299,123.60
  4. Step 4: Simplify right side
    485,747.60x = 217,947,856,205.04
  5. Step 5: Solve for x
    x = 217,947,856,205.04/485,747.60
  6. Step 6: Final answer
    x = 448,685.40

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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.