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Finding the Fourth Proportional to 686.64, 1,028.40 and 531.72

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Solution

The fourth proportional to 686.64, 1,028.40 and 531.72 is: 796.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.64 : 1,028.40 = 531.72 : x
  2. Step 2: Convert to fraction form
    686.64/1,028.40 = 531.72/x
  3. Step 3: Cross multiply
    686.64x = 1,028.40 × 531.72
  4. Step 4: Simplify right side
    686.64x = 546,820.85
  5. Step 5: Solve for x
    x = 546,820.85/686.64
  6. Step 6: Final answer
    x = 796.37

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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.