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Finding the Fourth Proportional to 104.02, 143.49 and 91.78

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Solution

The fourth proportional to 104.02, 143.49 and 91.78 is: 126.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.02 : 143.49 = 91.78 : x
  2. Step 2: Convert to fraction form
    104.02/143.49 = 91.78/x
  3. Step 3: Cross multiply
    104.02x = 143.49 × 91.78
  4. Step 4: Simplify right side
    104.02x = 13,169.51
  5. Step 5: Solve for x
    x = 13,169.51/104.02
  6. Step 6: Final answer
    x = 126.61

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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.