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Finding the Fourth Proportional to 17.65, 24.36 and 12.80

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Solution

The fourth proportional to 17.65, 24.36 and 12.80 is: 17.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.65 : 24.36 = 12.80 : x
  2. Step 2: Convert to fraction form
    17.65/24.36 = 12.80/x
  3. Step 3: Cross multiply
    17.65x = 24.36 × 12.80
  4. Step 4: Simplify right side
    17.65x = 311.82
  5. Step 5: Solve for x
    x = 311.82/17.65
  6. Step 6: Final answer
    x = 17.67

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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.