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Finding the Fourth Proportional to 104.15, 143.77 and 74.65

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Solution

The fourth proportional to 104.15, 143.77 and 74.65 is: 103.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.15 : 143.77 = 74.65 : x
  2. Step 2: Convert to fraction form
    104.15/143.77 = 74.65/x
  3. Step 3: Cross multiply
    104.15x = 143.77 × 74.65
  4. Step 4: Simplify right side
    104.15x = 10,731.88
  5. Step 5: Solve for x
    x = 10,731.88/104.15
  6. Step 6: Final answer
    x = 103.05

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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.