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Finding the Fourth Proportional to 137.58, 189.79 and 93.90

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Solution

The fourth proportional to 137.58, 189.79 and 93.90 is: 129.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.58 : 189.79 = 93.90 : x
  2. Step 2: Convert to fraction form
    137.58/189.79 = 93.90/x
  3. Step 3: Cross multiply
    137.58x = 189.79 × 93.90
  4. Step 4: Simplify right side
    137.58x = 17,821.28
  5. Step 5: Solve for x
    x = 17,821.28/137.58
  6. Step 6: Final answer
    x = 129.53

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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.