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Finding the Fourth Proportional to 724.52, 1,085.34 and 621.80

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Solution

The fourth proportional to 724.52, 1,085.34 and 621.80 is: 931.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.52 : 1,085.34 = 621.80 : x
  2. Step 2: Convert to fraction form
    724.52/1,085.34 = 621.80/x
  3. Step 3: Cross multiply
    724.52x = 1,085.34 × 621.80
  4. Step 4: Simplify right side
    724.52x = 674,864.41
  5. Step 5: Solve for x
    x = 674,864.41/724.52
  6. Step 6: Final answer
    x = 931.46

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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.