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Finding the Fourth Proportional to 12.14, 16.72 and 9.40

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Solution

The fourth proportional to 12.14, 16.72 and 9.40 is: 12.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.14 : 16.72 = 9.40 : x
  2. Step 2: Convert to fraction form
    12.14/16.72 = 9.40/x
  3. Step 3: Cross multiply
    12.14x = 16.72 × 9.40
  4. Step 4: Simplify right side
    12.14x = 157.17
  5. Step 5: Solve for x
    x = 157.17/12.14
  6. Step 6: Final answer
    x = 12.95

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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.