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Finding the Fourth Proportional to 807.81, 1,211.87 and 534.13

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Solution

The fourth proportional to 807.81, 1,211.87 and 534.13 is: 801.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    807.81 : 1,211.87 = 534.13 : x
  2. Step 2: Convert to fraction form
    807.81/1,211.87 = 534.13/x
  3. Step 3: Cross multiply
    807.81x = 1,211.87 × 534.13
  4. Step 4: Simplify right side
    807.81x = 647,293.45
  5. Step 5: Solve for x
    x = 647,293.45/807.81
  6. Step 6: Final answer
    x = 801.29

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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.