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Finding the Fourth Proportional to 92.08, 138.24 and 70.72

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Solution

The fourth proportional to 92.08, 138.24 and 70.72 is: 106.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.08 : 138.24 = 70.72 : x
  2. Step 2: Convert to fraction form
    92.08/138.24 = 70.72/x
  3. Step 3: Cross multiply
    92.08x = 138.24 × 70.72
  4. Step 4: Simplify right side
    92.08x = 9,776.33
  5. Step 5: Solve for x
    x = 9,776.33/92.08
  6. Step 6: Final answer
    x = 106.17

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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.