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Finding the Fourth Proportional to 137.45, 189.67 and 75.28

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Solution

The fourth proportional to 137.45, 189.67 and 75.28 is: 103.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.45 : 189.67 = 75.28 : x
  2. Step 2: Convert to fraction form
    137.45/189.67 = 75.28/x
  3. Step 3: Cross multiply
    137.45x = 189.67 × 75.28
  4. Step 4: Simplify right side
    137.45x = 14,278.46
  5. Step 5: Solve for x
    x = 14,278.46/137.45
  6. Step 6: Final answer
    x = 103.88

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