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Finding the Fourth Proportional to 811.25, 1,119.70 and 516.45

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Solution

The fourth proportional to 811.25, 1,119.70 and 516.45 is: 712.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.25 : 1,119.70 = 516.45 : x
  2. Step 2: Convert to fraction form
    811.25/1,119.70 = 516.45/x
  3. Step 3: Cross multiply
    811.25x = 1,119.70 × 516.45
  4. Step 4: Simplify right side
    811.25x = 578,269.07
  5. Step 5: Solve for x
    x = 578,269.07/811.25
  6. Step 6: Final answer
    x = 712.81

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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.