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Finding the Fourth Proportional to 871.64, 1,199.90 and 649.88

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Solution

The fourth proportional to 871.64, 1,199.90 and 649.88 is: 894.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.64 : 1,199.90 = 649.88 : x
  2. Step 2: Convert to fraction form
    871.64/1,199.90 = 649.88/x
  3. Step 3: Cross multiply
    871.64x = 1,199.90 × 649.88
  4. Step 4: Simplify right side
    871.64x = 779,791.01
  5. Step 5: Solve for x
    x = 779,791.01/871.64
  6. Step 6: Final answer
    x = 894.63

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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.