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Finding the Fourth Proportional to 849.67, 1,272.39 and 540.61

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Solution

The fourth proportional to 849.67, 1,272.39 and 540.61 is: 809.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.67 : 1,272.39 = 540.61 : x
  2. Step 2: Convert to fraction form
    849.67/1,272.39 = 540.61/x
  3. Step 3: Cross multiply
    849.67x = 1,272.39 × 540.61
  4. Step 4: Simplify right side
    849.67x = 687,861.55
  5. Step 5: Solve for x
    x = 687,861.55/849.67
  6. Step 6: Final answer
    x = 809.57

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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.