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Finding the Fourth Proportional to 92.64, 138.92 and 68.24

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Solution

The fourth proportional to 92.64, 138.92 and 68.24 is: 102.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.64 : 138.92 = 68.24 : x
  2. Step 2: Convert to fraction form
    92.64/138.92 = 68.24/x
  3. Step 3: Cross multiply
    92.64x = 138.92 × 68.24
  4. Step 4: Simplify right side
    92.64x = 9,479.91
  5. Step 5: Solve for x
    x = 9,479.91/92.64
  6. Step 6: Final answer
    x = 102.33

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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.