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Finding the Fourth Proportional to 862.88, 1,292.40 and 666.44

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Solution

The fourth proportional to 862.88, 1,292.40 and 666.44 is: 998.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.88 : 1,292.40 = 666.44 : x
  2. Step 2: Convert to fraction form
    862.88/1,292.40 = 666.44/x
  3. Step 3: Cross multiply
    862.88x = 1,292.40 × 666.44
  4. Step 4: Simplify right side
    862.88x = 861,310.29
  5. Step 5: Solve for x
    x = 861,310.29/862.88
  6. Step 6: Final answer
    x = 998.18

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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.