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Finding the Fourth Proportional to 724.25, 998.48 and 618.89

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Solution

The fourth proportional to 724.25, 998.48 and 618.89 is: 853.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.25 : 998.48 = 618.89 : x
  2. Step 2: Convert to fraction form
    724.25/998.48 = 618.89/x
  3. Step 3: Cross multiply
    724.25x = 998.48 × 618.89
  4. Step 4: Simplify right side
    724.25x = 617,945.84
  5. Step 5: Solve for x
    x = 617,945.84/724.25
  6. Step 6: Final answer
    x = 853.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.