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Finding the Fourth Proportional to 892.45, 1,231.61 and 499.45

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Solution

The fourth proportional to 892.45, 1,231.61 and 499.45 is: 689.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.45 : 1,231.61 = 499.45 : x
  2. Step 2: Convert to fraction form
    892.45/1,231.61 = 499.45/x
  3. Step 3: Cross multiply
    892.45x = 1,231.61 × 499.45
  4. Step 4: Simplify right side
    892.45x = 615,125.12
  5. Step 5: Solve for x
    x = 615,125.12/892.45
  6. Step 6: Final answer
    x = 689.25

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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.