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Finding the Fourth Proportional to 92.18, 138.15 and 57.90

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Solution

The fourth proportional to 92.18, 138.15 and 57.90 is: 86.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.18 : 138.15 = 57.90 : x
  2. Step 2: Convert to fraction form
    92.18/138.15 = 57.90/x
  3. Step 3: Cross multiply
    92.18x = 138.15 × 57.90
  4. Step 4: Simplify right side
    92.18x = 7,998.89
  5. Step 5: Solve for x
    x = 7,998.89/92.18
  6. Step 6: Final answer
    x = 86.77

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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.