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Finding the Fourth Proportional to 723.79, 1,085.03 and 614.80

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Solution

The fourth proportional to 723.79, 1,085.03 and 614.80 is: 921.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.79 : 1,085.03 = 614.80 : x
  2. Step 2: Convert to fraction form
    723.79/1,085.03 = 614.80/x
  3. Step 3: Cross multiply
    723.79x = 1,085.03 × 614.80
  4. Step 4: Simplify right side
    723.79x = 667,067.94
  5. Step 5: Solve for x
    x = 667,067.94/723.79
  6. Step 6: Final answer
    x = 921.64

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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.