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Finding the Fourth Proportional to 14.38, 21.57 and 6.78

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Solution

The fourth proportional to 14.38, 21.57 and 6.78 is: 10.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.38 : 21.57 = 6.78 : x
  2. Step 2: Convert to fraction form
    14.38/21.57 = 6.78/x
  3. Step 3: Cross multiply
    14.38x = 21.57 × 6.78
  4. Step 4: Simplify right side
    14.38x = 146.24
  5. Step 5: Solve for x
    x = 146.24/14.38
  6. Step 6: Final answer
    x = 10.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.