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Finding the Fourth Proportional to 871.22, 1,200.12 and 649.79

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Solution

The fourth proportional to 871.22, 1,200.12 and 649.79 is: 895.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.22 : 1,200.12 = 649.79 : x
  2. Step 2: Convert to fraction form
    871.22/1,200.12 = 649.79/x
  3. Step 3: Cross multiply
    871.22x = 1,200.12 × 649.79
  4. Step 4: Simplify right side
    871.22x = 779,822.04
  5. Step 5: Solve for x
    x = 779,822.04/871.22
  6. Step 6: Final answer
    x = 895.09

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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.