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Finding the Fourth Proportional to 825.68, 1,236.20 and 440.08

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Solution

The fourth proportional to 825.68, 1,236.20 and 440.08 is: 658.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.68 : 1,236.20 = 440.08 : x
  2. Step 2: Convert to fraction form
    825.68/1,236.20 = 440.08/x
  3. Step 3: Cross multiply
    825.68x = 1,236.20 × 440.08
  4. Step 4: Simplify right side
    825.68x = 544,026.90
  5. Step 5: Solve for x
    x = 544,026.90/825.68
  6. Step 6: Final answer
    x = 658.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.