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Finding the Fourth Proportional to 909.85, 1,255.59 and 516.95

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Solution

The fourth proportional to 909.85, 1,255.59 and 516.95 is: 713.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.85 : 1,255.59 = 516.95 : x
  2. Step 2: Convert to fraction form
    909.85/1,255.59 = 516.95/x
  3. Step 3: Cross multiply
    909.85x = 1,255.59 × 516.95
  4. Step 4: Simplify right side
    909.85x = 649,077.25
  5. Step 5: Solve for x
    x = 649,077.25/909.85
  6. Step 6: Final answer
    x = 713.39

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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.