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Finding the Fourth Proportional to 144.21, 199.05 and 86.04

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Solution

The fourth proportional to 144.21, 199.05 and 86.04 is: 118.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.21 : 199.05 = 86.04 : x
  2. Step 2: Convert to fraction form
    144.21/199.05 = 86.04/x
  3. Step 3: Cross multiply
    144.21x = 199.05 × 86.04
  4. Step 4: Simplify right side
    144.21x = 17,126.26
  5. Step 5: Solve for x
    x = 17,126.26/144.21
  6. Step 6: Final answer
    x = 118.76

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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.