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Finding the Fourth Proportional to 104.21, 143.82 and 86.69

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Solution

The fourth proportional to 104.21, 143.82 and 86.69 is: 119.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.21 : 143.82 = 86.69 : x
  2. Step 2: Convert to fraction form
    104.21/143.82 = 86.69/x
  3. Step 3: Cross multiply
    104.21x = 143.82 × 86.69
  4. Step 4: Simplify right side
    104.21x = 12,468.66
  5. Step 5: Solve for x
    x = 12,468.66/104.21
  6. Step 6: Final answer
    x = 119.65

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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.