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Finding the Fourth Proportional to 909.71, 1,255.44 and 516.71

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Solution

The fourth proportional to 909.71, 1,255.44 and 516.71 is: 713.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.71 : 1,255.44 = 516.71 : x
  2. Step 2: Convert to fraction form
    909.71/1,255.44 = 516.71/x
  3. Step 3: Cross multiply
    909.71x = 1,255.44 × 516.71
  4. Step 4: Simplify right side
    909.71x = 648,698.40
  5. Step 5: Solve for x
    x = 648,698.40/909.71
  6. Step 6: Final answer
    x = 713.08

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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.