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Finding the Fourth Proportional to 892.74, 1,231.92 and 499.71

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Solution

The fourth proportional to 892.74, 1,231.92 and 499.71 is: 689.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.74 : 1,231.92 = 499.71 : x
  2. Step 2: Convert to fraction form
    892.74/1,231.92 = 499.71/x
  3. Step 3: Cross multiply
    892.74x = 1,231.92 × 499.71
  4. Step 4: Simplify right side
    892.74x = 615,602.74
  5. Step 5: Solve for x
    x = 615,602.74/892.74
  6. Step 6: Final answer
    x = 689.57

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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.