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Finding the Fourth Proportional to 827.52, 1,139.12 and 715.44

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Solution

The fourth proportional to 827.52, 1,139.12 and 715.44 is: 984.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.52 : 1,139.12 = 715.44 : x
  2. Step 2: Convert to fraction form
    827.52/1,139.12 = 715.44/x
  3. Step 3: Cross multiply
    827.52x = 1,139.12 × 715.44
  4. Step 4: Simplify right side
    827.52x = 814,968.44
  5. Step 5: Solve for x
    x = 814,968.44/827.52
  6. Step 6: Final answer
    x = 984.83

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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.