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Finding the Fourth Proportional to 724.90, 1,085.43 and 664.75

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Solution

The fourth proportional to 724.90, 1,085.43 and 664.75 is: 995.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.90 : 1,085.43 = 664.75 : x
  2. Step 2: Convert to fraction form
    724.90/1,085.43 = 664.75/x
  3. Step 3: Cross multiply
    724.90x = 1,085.43 × 664.75
  4. Step 4: Simplify right side
    724.90x = 721,539.59
  5. Step 5: Solve for x
    x = 721,539.59/724.90
  6. Step 6: Final answer
    x = 995.36

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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.