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Finding the Fourth Proportional to 14.25, 21.26 and 12.55

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Solution

The fourth proportional to 14.25, 21.26 and 12.55 is: 18.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.25 : 21.26 = 12.55 : x
  2. Step 2: Convert to fraction form
    14.25/21.26 = 12.55/x
  3. Step 3: Cross multiply
    14.25x = 21.26 × 12.55
  4. Step 4: Simplify right side
    14.25x = 266.81
  5. Step 5: Solve for x
    x = 266.81/14.25
  6. Step 6: Final answer
    x = 18.72

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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.