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Finding the Fourth Proportional to 199.40, 275.20 and 144.32

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Solution

The fourth proportional to 199.40, 275.20 and 144.32 is: 199.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.40 : 275.20 = 144.32 : x
  2. Step 2: Convert to fraction form
    199.40/275.20 = 144.32/x
  3. Step 3: Cross multiply
    199.40x = 275.20 × 144.32
  4. Step 4: Simplify right side
    199.40x = 39,716.86
  5. Step 5: Solve for x
    x = 39,716.86/199.40
  6. Step 6: Final answer
    x = 199.18

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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.