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Finding the Fourth Proportional to 892.60, 1,231.80 and 499.61

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Solution

The fourth proportional to 892.60, 1,231.80 and 499.61 is: 689.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.60 : 1,231.80 = 499.61 : x
  2. Step 2: Convert to fraction form
    892.60/1,231.80 = 499.61/x
  3. Step 3: Cross multiply
    892.60x = 1,231.80 × 499.61
  4. Step 4: Simplify right side
    892.60x = 615,419.60
  5. Step 5: Solve for x
    x = 615,419.60/892.60
  6. Step 6: Final answer
    x = 689.47

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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.