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Finding the Fourth Proportional to 74.78, 103.10 and 68.66

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Solution

The fourth proportional to 74.78, 103.10 and 68.66 is: 94.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.78 : 103.10 = 68.66 : x
  2. Step 2: Convert to fraction form
    74.78/103.10 = 68.66/x
  3. Step 3: Cross multiply
    74.78x = 103.10 × 68.66
  4. Step 4: Simplify right side
    74.78x = 7,078.85
  5. Step 5: Solve for x
    x = 7,078.85/74.78
  6. Step 6: Final answer
    x = 94.66

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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.