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Finding the Fourth Proportional to 138.30, 190.90 and 94.70

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Solution

The fourth proportional to 138.30, 190.90 and 94.70 is: 130.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.30 : 190.90 = 94.70 : x
  2. Step 2: Convert to fraction form
    138.30/190.90 = 94.70/x
  3. Step 3: Cross multiply
    138.30x = 190.90 × 94.70
  4. Step 4: Simplify right side
    138.30x = 18,078.23
  5. Step 5: Solve for x
    x = 18,078.23/138.30
  6. Step 6: Final answer
    x = 130.72

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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.