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Finding the Fourth Proportional to 15.88, 21.94 and 13.72

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Solution

The fourth proportional to 15.88, 21.94 and 13.72 is: 18.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.88 : 21.94 = 13.72 : x
  2. Step 2: Convert to fraction form
    15.88/21.94 = 13.72/x
  3. Step 3: Cross multiply
    15.88x = 21.94 × 13.72
  4. Step 4: Simplify right side
    15.88x = 301.02
  5. Step 5: Solve for x
    x = 301.02/15.88
  6. Step 6: Final answer
    x = 18.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.