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Finding the Fourth Proportional to 872.85, 1,204.60 and 499.85

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Solution

The fourth proportional to 872.85, 1,204.60 and 499.85 is: 689.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.85 : 1,204.60 = 499.85 : x
  2. Step 2: Convert to fraction form
    872.85/1,204.60 = 499.85/x
  3. Step 3: Cross multiply
    872.85x = 1,204.60 × 499.85
  4. Step 4: Simplify right side
    872.85x = 602,112.70
  5. Step 5: Solve for x
    x = 602,112.70/872.85
  6. Step 6: Final answer
    x = 689.82

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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.