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Finding the Fourth Proportional to 92.37, 137.97 and 87.11

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Solution

The fourth proportional to 92.37, 137.97 and 87.11 is: 130.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.37 : 137.97 = 87.11 : x
  2. Step 2: Convert to fraction form
    92.37/137.97 = 87.11/x
  3. Step 3: Cross multiply
    92.37x = 137.97 × 87.11
  4. Step 4: Simplify right side
    92.37x = 12,018.39
  5. Step 5: Solve for x
    x = 12,018.39/92.37
  6. Step 6: Final answer
    x = 130.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.