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Finding the Fourth Proportional to 92.18, 138.22 and 48.83

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Solution

The fourth proportional to 92.18, 138.22 and 48.83 is: 73.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.18 : 138.22 = 48.83 : x
  2. Step 2: Convert to fraction form
    92.18/138.22 = 48.83/x
  3. Step 3: Cross multiply
    92.18x = 138.22 × 48.83
  4. Step 4: Simplify right side
    92.18x = 6,748.47
  5. Step 5: Solve for x
    x = 6,748.47/92.18
  6. Step 6: Final answer
    x = 73.21

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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.