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Finding the Fourth Proportional to 679.11, 1,017.18 and 531.87

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Solution

The fourth proportional to 679.11, 1,017.18 and 531.87 is: 796.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.11 : 1,017.18 = 531.87 : x
  2. Step 2: Convert to fraction form
    679.11/1,017.18 = 531.87/x
  3. Step 3: Cross multiply
    679.11x = 1,017.18 × 531.87
  4. Step 4: Simplify right side
    679.11x = 541,005.21
  5. Step 5: Solve for x
    x = 541,005.21/679.11
  6. Step 6: Final answer
    x = 796.64

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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.