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Finding the Fourth Proportional to 811.29, 1,119.75 and 516.50

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Solution

The fourth proportional to 811.29, 1,119.75 and 516.50 is: 712.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.29 : 1,119.75 = 516.50 : x
  2. Step 2: Convert to fraction form
    811.29/1,119.75 = 516.50/x
  3. Step 3: Cross multiply
    811.29x = 1,119.75 × 516.50
  4. Step 4: Simplify right side
    811.29x = 578,345.28
  5. Step 5: Solve for x
    x = 578,345.28/811.29
  6. Step 6: Final answer
    x = 712.87

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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.