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Finding the Fourth Proportional to 909.79, 1,255.58 and 516.84

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Solution

The fourth proportional to 909.79, 1,255.58 and 516.84 is: 713.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.79 : 1,255.58 = 516.84 : x
  2. Step 2: Convert to fraction form
    909.79/1,255.58 = 516.84/x
  3. Step 3: Cross multiply
    909.79x = 1,255.58 × 516.84
  4. Step 4: Simplify right side
    909.79x = 648,933.97
  5. Step 5: Solve for x
    x = 648,933.97/909.79
  6. Step 6: Final answer
    x = 713.28

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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.