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Finding the Fourth Proportional to 516.88, 712.26 and 385.66

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Solution

The fourth proportional to 516.88, 712.26 and 385.66 is: 531.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.88 : 712.26 = 385.66 : x
  2. Step 2: Convert to fraction form
    516.88/712.26 = 385.66/x
  3. Step 3: Cross multiply
    516.88x = 712.26 × 385.66
  4. Step 4: Simplify right side
    516.88x = 274,690.19
  5. Step 5: Solve for x
    x = 274,690.19/516.88
  6. Step 6: Final answer
    x = 531.44

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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.