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Finding the Fourth Proportional to 810.55, 1,118.92 and 516.21

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Solution

The fourth proportional to 810.55, 1,118.92 and 516.21 is: 712.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.55 : 1,118.92 = 516.21 : x
  2. Step 2: Convert to fraction form
    810.55/1,118.92 = 516.21/x
  3. Step 3: Cross multiply
    810.55x = 1,118.92 × 516.21
  4. Step 4: Simplify right side
    810.55x = 577,597.69
  5. Step 5: Solve for x
    x = 577,597.69/810.55
  6. Step 6: Final answer
    x = 712.60

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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.