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Finding the Fourth Proportional to 137.28, 189.38 and 88.12

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Solution

The fourth proportional to 137.28, 189.38 and 88.12 is: 121.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.28 : 189.38 = 88.12 : x
  2. Step 2: Convert to fraction form
    137.28/189.38 = 88.12/x
  3. Step 3: Cross multiply
    137.28x = 189.38 × 88.12
  4. Step 4: Simplify right side
    137.28x = 16,688.17
  5. Step 5: Solve for x
    x = 16,688.17/137.28
  6. Step 6: Final answer
    x = 121.56

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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.