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Finding the Fourth Proportional to 724.04, 998.70 and 679.80

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Solution

The fourth proportional to 724.04, 998.70 and 679.80 is: 937.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.04 : 998.70 = 679.80 : x
  2. Step 2: Convert to fraction form
    724.04/998.70 = 679.80/x
  3. Step 3: Cross multiply
    724.04x = 998.70 × 679.80
  4. Step 4: Simplify right side
    724.04x = 678,916.26
  5. Step 5: Solve for x
    x = 678,916.26/724.04
  6. Step 6: Final answer
    x = 937.68

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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.