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Finding the Fourth Proportional to 724.85, 998.64 and 500.57

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Solution

The fourth proportional to 724.85, 998.64 and 500.57 is: 689.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.85 : 998.64 = 500.57 : x
  2. Step 2: Convert to fraction form
    724.85/998.64 = 500.57/x
  3. Step 3: Cross multiply
    724.85x = 998.64 × 500.57
  4. Step 4: Simplify right side
    724.85x = 499,889.22
  5. Step 5: Solve for x
    x = 499,889.22/724.85
  6. Step 6: Final answer
    x = 689.65

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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.