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Finding the Fourth Proportional to 847.20, 1,269.56 and 481.20

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Solution

The fourth proportional to 847.20, 1,269.56 and 481.20 is: 721.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.20 : 1,269.56 = 481.20 : x
  2. Step 2: Convert to fraction form
    847.20/1,269.56 = 481.20/x
  3. Step 3: Cross multiply
    847.20x = 1,269.56 × 481.20
  4. Step 4: Simplify right side
    847.20x = 610,912.27
  5. Step 5: Solve for x
    x = 610,912.27/847.20
  6. Step 6: Final answer
    x = 721.10

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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.