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Finding the Fourth Proportional to 806.30, 1,207.39 and 531.55

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Solution

The fourth proportional to 806.30, 1,207.39 and 531.55 is: 795.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.30 : 1,207.39 = 531.55 : x
  2. Step 2: Convert to fraction form
    806.30/1,207.39 = 531.55/x
  3. Step 3: Cross multiply
    806.30x = 1,207.39 × 531.55
  4. Step 4: Simplify right side
    806.30x = 641,791.84
  5. Step 5: Solve for x
    x = 641,791.84/806.30
  6. Step 6: Final answer
    x = 795.98

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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.