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Finding the Fourth Proportional to 14.25, 21.40 and 11.72

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Solution

The fourth proportional to 14.25, 21.40 and 11.72 is: 17.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.25 : 21.40 = 11.72 : x
  2. Step 2: Convert to fraction form
    14.25/21.40 = 11.72/x
  3. Step 3: Cross multiply
    14.25x = 21.40 × 11.72
  4. Step 4: Simplify right side
    14.25x = 250.71
  5. Step 5: Solve for x
    x = 250.71/14.25
  6. Step 6: Final answer
    x = 17.60

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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.