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Finding the Fourth Proportional to 137.69, 189.91 and 87.92

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Solution

The fourth proportional to 137.69, 189.91 and 87.92 is: 121.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.69 : 189.91 = 87.92 : x
  2. Step 2: Convert to fraction form
    137.69/189.91 = 87.92/x
  3. Step 3: Cross multiply
    137.69x = 189.91 × 87.92
  4. Step 4: Simplify right side
    137.69x = 16,696.89
  5. Step 5: Solve for x
    x = 16,696.89/137.69
  6. Step 6: Final answer
    x = 121.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.