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Finding the Fourth Proportional to 892.39, 1,231.50 and 499.42

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Solution

The fourth proportional to 892.39, 1,231.50 and 499.42 is: 689.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.39 : 1,231.50 = 499.42 : x
  2. Step 2: Convert to fraction form
    892.39/1,231.50 = 499.42/x
  3. Step 3: Cross multiply
    892.39x = 1,231.50 × 499.42
  4. Step 4: Simplify right side
    892.39x = 615,035.73
  5. Step 5: Solve for x
    x = 615,035.73/892.39
  6. Step 6: Final answer
    x = 689.20

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1.5x scale

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.