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Finding the Fourth Proportional to 14, 19.40 and 13.72

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Solution

The fourth proportional to 14, 19.40 and 13.72 is: 19.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    14 : 19.40 = 13.72 : x
  2. Step 2: Convert to fraction form
    14/19.40 = 13.72/x
  3. Step 3: Cross multiply
    14x = 19.40 × 13.72
  4. Step 4: Simplify right side
    14x = 266.17
  5. Step 5: Solve for x
    x = 266.17/14
  6. Step 6: Final answer
    x = 19.01

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.