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Finding the Fourth Proportional to 825.27, 1,138.40 and 493.58

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Solution

The fourth proportional to 825.27, 1,138.40 and 493.58 is: 680.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.27 : 1,138.40 = 493.58 : x
  2. Step 2: Convert to fraction form
    825.27/1,138.40 = 493.58/x
  3. Step 3: Cross multiply
    825.27x = 1,138.40 × 493.58
  4. Step 4: Simplify right side
    825.27x = 561,891.47
  5. Step 5: Solve for x
    x = 561,891.47/825.27
  6. Step 6: Final answer
    x = 680.86

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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.