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Finding the Fourth Proportional to 75.78, 104.42 and 73.08

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Solution

The fourth proportional to 75.78, 104.42 and 73.08 is: 100.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.78 : 104.42 = 73.08 : x
  2. Step 2: Convert to fraction form
    75.78/104.42 = 73.08/x
  3. Step 3: Cross multiply
    75.78x = 104.42 × 73.08
  4. Step 4: Simplify right side
    75.78x = 7,630.65
  5. Step 5: Solve for x
    x = 7,630.65/75.78
  6. Step 6: Final answer
    x = 100.69

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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.