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Finding the Fourth Proportional to 92.75, 138.99 and 72.40

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Solution

The fourth proportional to 92.75, 138.99 and 72.40 is: 108.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.75 : 138.99 = 72.40 : x
  2. Step 2: Convert to fraction form
    92.75/138.99 = 72.40/x
  3. Step 3: Cross multiply
    92.75x = 138.99 × 72.40
  4. Step 4: Simplify right side
    92.75x = 10,062.88
  5. Step 5: Solve for x
    x = 10,062.88/92.75
  6. Step 6: Final answer
    x = 108.49

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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.