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Finding the Fourth Proportional to 892.72, 1,231.95 and 499.75

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Solution

The fourth proportional to 892.72, 1,231.95 and 499.75 is: 689.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.72 : 1,231.95 = 499.75 : x
  2. Step 2: Convert to fraction form
    892.72/1,231.95 = 499.75/x
  3. Step 3: Cross multiply
    892.72x = 1,231.95 × 499.75
  4. Step 4: Simplify right side
    892.72x = 615,667.01
  5. Step 5: Solve for x
    x = 615,667.01/892.72
  6. Step 6: Final answer
    x = 689.65

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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.