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Finding the Fourth Proportional to 807.62, 1,211.40 and 480.82

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Solution

The fourth proportional to 807.62, 1,211.40 and 480.82 is: 721.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.62 : 1,211.40 = 480.82 : x
  2. Step 2: Convert to fraction form
    807.62/1,211.40 = 480.82/x
  3. Step 3: Cross multiply
    807.62x = 1,211.40 × 480.82
  4. Step 4: Simplify right side
    807.62x = 582,463.52
  5. Step 5: Solve for x
    x = 582,463.52/807.62
  6. Step 6: Final answer
    x = 721.21

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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.