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Finding the Fourth Proportional to 14.58, 21.78 and 12.43

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Solution

The fourth proportional to 14.58, 21.78 and 12.43 is: 18.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.58 : 21.78 = 12.43 : x
  2. Step 2: Convert to fraction form
    14.58/21.78 = 12.43/x
  3. Step 3: Cross multiply
    14.58x = 21.78 × 12.43
  4. Step 4: Simplify right side
    14.58x = 270.73
  5. Step 5: Solve for x
    x = 270.73/14.58
  6. Step 6: Final answer
    x = 18.57

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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.