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Finding the Fourth Proportional to 807.92, 1,211.28 and 345.92

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Solution

The fourth proportional to 807.92, 1,211.28 and 345.92 is: 518.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.92 : 1,211.28 = 345.92 : x
  2. Step 2: Convert to fraction form
    807.92/1,211.28 = 345.92/x
  3. Step 3: Cross multiply
    807.92x = 1,211.28 × 345.92
  4. Step 4: Simplify right side
    807.92x = 418,999.92
  5. Step 5: Solve for x
    x = 418,999.92/807.92
  6. Step 6: Final answer
    x = 518.62

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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.