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Finding the Fourth Proportional to 862.08, 1,292.21 and 422.72

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Solution

The fourth proportional to 862.08, 1,292.21 and 422.72 is: 633.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.08 : 1,292.21 = 422.72 : x
  2. Step 2: Convert to fraction form
    862.08/1,292.21 = 422.72/x
  3. Step 3: Cross multiply
    862.08x = 1,292.21 × 422.72
  4. Step 4: Simplify right side
    862.08x = 546,240.87
  5. Step 5: Solve for x
    x = 546,240.87/862.08
  6. Step 6: Final answer
    x = 633.63

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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.