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Finding the Fourth Proportional to 137.00, 189.05 and 78.78

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Solution

The fourth proportional to 137.00, 189.05 and 78.78 is: 108.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.00 : 189.05 = 78.78 : x
  2. Step 2: Convert to fraction form
    137.00/189.05 = 78.78/x
  3. Step 3: Cross multiply
    137.00x = 189.05 × 78.78
  4. Step 4: Simplify right side
    137.00x = 14,892.97
  5. Step 5: Solve for x
    x = 14,892.97/137.00
  6. Step 6: Final answer
    x = 108.71

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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.