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Finding the Fourth Proportional to 137.57, 189.72 and 100.67

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Solution

The fourth proportional to 137.57, 189.72 and 100.67 is: 138.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.57 : 189.72 = 100.67 : x
  2. Step 2: Convert to fraction form
    137.57/189.72 = 100.67/x
  3. Step 3: Cross multiply
    137.57x = 189.72 × 100.67
  4. Step 4: Simplify right side
    137.57x = 19,099.11
  5. Step 5: Solve for x
    x = 19,099.11/137.57
  6. Step 6: Final answer
    x = 138.83

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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.