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Finding the Fourth Proportional to 14.72, 21.91 and 14.68

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Solution

The fourth proportional to 14.72, 21.91 and 14.68 is: 21.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.72 : 21.91 = 14.68 : x
  2. Step 2: Convert to fraction form
    14.72/21.91 = 14.68/x
  3. Step 3: Cross multiply
    14.72x = 21.91 × 14.68
  4. Step 4: Simplify right side
    14.72x = 321.64
  5. Step 5: Solve for x
    x = 321.64/14.72
  6. Step 6: Final answer
    x = 21.85

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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.