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Finding the Fourth Proportional to 14.35, 21.39 and 13.87

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Solution

The fourth proportional to 14.35, 21.39 and 13.87 is: 20.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.35 : 21.39 = 13.87 : x
  2. Step 2: Convert to fraction form
    14.35/21.39 = 13.87/x
  3. Step 3: Cross multiply
    14.35x = 21.39 × 13.87
  4. Step 4: Simplify right side
    14.35x = 296.57
  5. Step 5: Solve for x
    x = 296.57/14.35
  6. Step 6: Final answer
    x = 20.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.