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Finding the Fourth Proportional to 909.79, 1,255.49 and 495.79

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Solution

The fourth proportional to 909.79, 1,255.49 and 495.79 is: 684.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.79 : 1,255.49 = 495.79 : x
  2. Step 2: Convert to fraction form
    909.79/1,255.49 = 495.79/x
  3. Step 3: Cross multiply
    909.79x = 1,255.49 × 495.79
  4. Step 4: Simplify right side
    909.79x = 622,459.39
  5. Step 5: Solve for x
    x = 622,459.39/909.79
  6. Step 6: Final answer
    x = 684.18

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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.