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Finding the Fourth Proportional to 17.72, 24.34 and 15.67

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Solution

The fourth proportional to 17.72, 24.34 and 15.67 is: 21.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.72 : 24.34 = 15.67 : x
  2. Step 2: Convert to fraction form
    17.72/24.34 = 15.67/x
  3. Step 3: Cross multiply
    17.72x = 24.34 × 15.67
  4. Step 4: Simplify right side
    17.72x = 381.40
  5. Step 5: Solve for x
    x = 381.40/17.72
  6. Step 6: Final answer
    x = 21.52

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.