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Finding the Fourth Proportional to 92.40, 138.61 and 28.28

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Solution

The fourth proportional to 92.40, 138.61 and 28.28 is: 42.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.40 : 138.61 = 28.28 : x
  2. Step 2: Convert to fraction form
    92.40/138.61 = 28.28/x
  3. Step 3: Cross multiply
    92.40x = 138.61 × 28.28
  4. Step 4: Simplify right side
    92.40x = 3,919.89
  5. Step 5: Solve for x
    x = 3,919.89/92.40
  6. Step 6: Final answer
    x = 42.42

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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.