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Finding the Fourth Proportional to 137.63, 189.86 and 104.87

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Solution

The fourth proportional to 137.63, 189.86 and 104.87 is: 144.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.63 : 189.86 = 104.87 : x
  2. Step 2: Convert to fraction form
    137.63/189.86 = 104.87/x
  3. Step 3: Cross multiply
    137.63x = 189.86 × 104.87
  4. Step 4: Simplify right side
    137.63x = 19,909.14
  5. Step 5: Solve for x
    x = 19,909.14/137.63
  6. Step 6: Final answer
    x = 144.66

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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.