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Finding the Fourth Proportional to 909.83, 1,255.57 and 516.78

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Solution

The fourth proportional to 909.83, 1,255.57 and 516.78 is: 713.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.83 : 1,255.57 = 516.78 : x
  2. Step 2: Convert to fraction form
    909.83/1,255.57 = 516.78/x
  3. Step 3: Cross multiply
    909.83x = 1,255.57 × 516.78
  4. Step 4: Simplify right side
    909.83x = 648,852.17
  5. Step 5: Solve for x
    x = 648,852.17/909.83
  6. Step 6: Final answer
    x = 713.16

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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.