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Finding the Fourth Proportional to 144.81, 217.09 and 90.74

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Solution

The fourth proportional to 144.81, 217.09 and 90.74 is: 136.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.81 : 217.09 = 90.74 : x
  2. Step 2: Convert to fraction form
    144.81/217.09 = 90.74/x
  3. Step 3: Cross multiply
    144.81x = 217.09 × 90.74
  4. Step 4: Simplify right side
    144.81x = 19,698.75
  5. Step 5: Solve for x
    x = 19,698.75/144.81
  6. Step 6: Final answer
    x = 136.03

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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.