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Finding the Fourth Proportional to 144.42, 199.38 and 100.80

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Solution

The fourth proportional to 144.42, 199.38 and 100.80 is: 139.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.42 : 199.38 = 100.80 : x
  2. Step 2: Convert to fraction form
    144.42/199.38 = 100.80/x
  3. Step 3: Cross multiply
    144.42x = 199.38 × 100.80
  4. Step 4: Simplify right side
    144.42x = 20,097.50
  5. Step 5: Solve for x
    x = 20,097.50/144.42
  6. Step 6: Final answer
    x = 139.16

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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.