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Finding the Fourth Proportional to 149.13, 205.84 and 86.96

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Solution

The fourth proportional to 149.13, 205.84 and 86.96 is: 120.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.13 : 205.84 = 86.96 : x
  2. Step 2: Convert to fraction form
    149.13/205.84 = 86.96/x
  3. Step 3: Cross multiply
    149.13x = 205.84 × 86.96
  4. Step 4: Simplify right side
    149.13x = 17,900.47
  5. Step 5: Solve for x
    x = 17,900.47/149.13
  6. Step 6: Final answer
    x = 120.03

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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.