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Finding the Fourth Proportional to 144.65, 199.51 and 103.21

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Solution

The fourth proportional to 144.65, 199.51 and 103.21 is: 142.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.65 : 199.51 = 103.21 : x
  2. Step 2: Convert to fraction form
    144.65/199.51 = 103.21/x
  3. Step 3: Cross multiply
    144.65x = 199.51 × 103.21
  4. Step 4: Simplify right side
    144.65x = 20,591.43
  5. Step 5: Solve for x
    x = 20,591.43/144.65
  6. Step 6: Final answer
    x = 142.35

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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.