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Finding the Fourth Proportional to 92.15, 138.19 and 67.40

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Solution

The fourth proportional to 92.15, 138.19 and 67.40 is: 101.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.15 : 138.19 = 67.40 : x
  2. Step 2: Convert to fraction form
    92.15/138.19 = 67.40/x
  3. Step 3: Cross multiply
    92.15x = 138.19 × 67.40
  4. Step 4: Simplify right side
    92.15x = 9,313.79
  5. Step 5: Solve for x
    x = 9,313.79/92.15
  6. Step 6: Final answer
    x = 101.07

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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.