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Finding the Fourth Proportional to 119.43, 179.45 and 90.57

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Solution

The fourth proportional to 119.43, 179.45 and 90.57 is: 136.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.43 : 179.45 = 90.57 : x
  2. Step 2: Convert to fraction form
    119.43/179.45 = 90.57/x
  3. Step 3: Cross multiply
    119.43x = 179.45 × 90.57
  4. Step 4: Simplify right side
    119.43x = 16,252.79
  5. Step 5: Solve for x
    x = 16,252.79/119.43
  6. Step 6: Final answer
    x = 136.09

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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.