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Finding the Fourth Proportional to 92.66, 138.98 and 68.76

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Solution

The fourth proportional to 92.66, 138.98 and 68.76 is: 103.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.66 : 138.98 = 68.76 : x
  2. Step 2: Convert to fraction form
    92.66/138.98 = 68.76/x
  3. Step 3: Cross multiply
    92.66x = 138.98 × 68.76
  4. Step 4: Simplify right side
    92.66x = 9,556.26
  5. Step 5: Solve for x
    x = 9,556.26/92.66
  6. Step 6: Final answer
    x = 103.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.