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Finding the Fourth Proportional to 137.87, 189.94 and 88.66

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Solution

The fourth proportional to 137.87, 189.94 and 88.66 is: 122.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.87 : 189.94 = 88.66 : x
  2. Step 2: Convert to fraction form
    137.87/189.94 = 88.66/x
  3. Step 3: Cross multiply
    137.87x = 189.94 × 88.66
  4. Step 4: Simplify right side
    137.87x = 16,840.33
  5. Step 5: Solve for x
    x = 16,840.33/137.87
  6. Step 6: Final answer
    x = 122.15

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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.