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Finding the Fourth Proportional to 144.50, 199.45 and 89.21

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Solution

The fourth proportional to 144.50, 199.45 and 89.21 is: 123.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.50 : 199.45 = 89.21 : x
  2. Step 2: Convert to fraction form
    144.50/199.45 = 89.21/x
  3. Step 3: Cross multiply
    144.50x = 199.45 × 89.21
  4. Step 4: Simplify right side
    144.50x = 17,791.70
  5. Step 5: Solve for x
    x = 17,791.70/144.50
  6. Step 6: Final answer
    x = 123.13

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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.