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Finding the Fourth Proportional to 343.90, 515.85 and 112.79

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Solution

The fourth proportional to 343.90, 515.85 and 112.79 is: 169.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.90 : 515.85 = 112.79 : x
  2. Step 2: Convert to fraction form
    343.90/515.85 = 112.79/x
  3. Step 3: Cross multiply
    343.90x = 515.85 × 112.79
  4. Step 4: Simplify right side
    343.90x = 58,180.14
  5. Step 5: Solve for x
    x = 58,180.14/343.90
  6. Step 6: Final answer
    x = 169.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.