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Finding the Fourth Proportional to 12.18, 16.78 and 10.65

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Solution

The fourth proportional to 12.18, 16.78 and 10.65 is: 14.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.18 : 16.78 = 10.65 : x
  2. Step 2: Convert to fraction form
    12.18/16.78 = 10.65/x
  3. Step 3: Cross multiply
    12.18x = 16.78 × 10.65
  4. Step 4: Simplify right side
    12.18x = 178.71
  5. Step 5: Solve for x
    x = 178.71/12.18
  6. Step 6: Final answer
    x = 14.67

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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.