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Finding the Fourth Proportional to 909.97, 1,255.76 and 516.99

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Solution

The fourth proportional to 909.97, 1,255.76 and 516.99 is: 713.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.97 : 1,255.76 = 516.99 : x
  2. Step 2: Convert to fraction form
    909.97/1,255.76 = 516.99/x
  3. Step 3: Cross multiply
    909.97x = 1,255.76 × 516.99
  4. Step 4: Simplify right side
    909.97x = 649,218.50
  5. Step 5: Solve for x
    x = 649,218.50/909.97
  6. Step 6: Final answer
    x = 713.45

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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.