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Finding the Fourth Proportional to 892.32, 1,231.40 and 499.34

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Solution

The fourth proportional to 892.32, 1,231.40 and 499.34 is: 689.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.32 : 1,231.40 = 499.34 : x
  2. Step 2: Convert to fraction form
    892.32/1,231.40 = 499.34/x
  3. Step 3: Cross multiply
    892.32x = 1,231.40 × 499.34
  4. Step 4: Simplify right side
    892.32x = 614,887.28
  5. Step 5: Solve for x
    x = 614,887.28/892.32
  6. Step 6: Final answer
    x = 689.09

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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.