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Finding the Fourth Proportional to 810.89, 1,118.85 and 516.59

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Solution

The fourth proportional to 810.89, 1,118.85 and 516.59 is: 712.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.89 : 1,118.85 = 516.59 : x
  2. Step 2: Convert to fraction form
    810.89/1,118.85 = 516.59/x
  3. Step 3: Cross multiply
    810.89x = 1,118.85 × 516.59
  4. Step 4: Simplify right side
    810.89x = 577,986.72
  5. Step 5: Solve for x
    x = 577,986.72/810.89
  6. Step 6: Final answer
    x = 712.78

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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.