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Finding the Fourth Proportional to 807.48, 1,209.60 and 481.68

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Solution

The fourth proportional to 807.48, 1,209.60 and 481.68 is: 721.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.48 : 1,209.60 = 481.68 : x
  2. Step 2: Convert to fraction form
    807.48/1,209.60 = 481.68/x
  3. Step 3: Cross multiply
    807.48x = 1,209.60 × 481.68
  4. Step 4: Simplify right side
    807.48x = 582,640.13
  5. Step 5: Solve for x
    x = 582,640.13/807.48
  6. Step 6: Final answer
    x = 721.55

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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.