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Finding the Fourth Proportional to 14.05, 19.39 and 7.91

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Solution

The fourth proportional to 14.05, 19.39 and 7.91 is: 10.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.05 : 19.39 = 7.91 : x
  2. Step 2: Convert to fraction form
    14.05/19.39 = 7.91/x
  3. Step 3: Cross multiply
    14.05x = 19.39 × 7.91
  4. Step 4: Simplify right side
    14.05x = 153.31
  5. Step 5: Solve for x
    x = 153.31/14.05
  6. Step 6: Final answer
    x = 10.91

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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.