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Finding the Fourth Proportional to 724.25, 1,085.45 and 626.75

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Solution

The fourth proportional to 724.25, 1,085.45 and 626.75 is: 939.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.25 : 1,085.45 = 626.75 : x
  2. Step 2: Convert to fraction form
    724.25/1,085.45 = 626.75/x
  3. Step 3: Cross multiply
    724.25x = 1,085.45 × 626.75
  4. Step 4: Simplify right side
    724.25x = 680,297.23
  5. Step 5: Solve for x
    x = 680,297.23/724.25
  6. Step 6: Final answer
    x = 939.32

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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.