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Finding the Fourth Proportional to 14.60, 21.94 and 12.78

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Solution

The fourth proportional to 14.60, 21.94 and 12.78 is: 19.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.60 : 21.94 = 12.78 : x
  2. Step 2: Convert to fraction form
    14.60/21.94 = 12.78/x
  3. Step 3: Cross multiply
    14.60x = 21.94 × 12.78
  4. Step 4: Simplify right side
    14.60x = 280.36
  5. Step 5: Solve for x
    x = 280.36/14.60
  6. Step 6: Final answer
    x = 19.20

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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.