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Finding the Fourth Proportional to 12.18, 16.78 and 8.53

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Solution

The fourth proportional to 12.18, 16.78 and 8.53 is: 11.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.18 : 16.78 = 8.53 : x
  2. Step 2: Convert to fraction form
    12.18/16.78 = 8.53/x
  3. Step 3: Cross multiply
    12.18x = 16.78 × 8.53
  4. Step 4: Simplify right side
    12.18x = 143.13
  5. Step 5: Solve for x
    x = 143.13/12.18
  6. Step 6: Final answer
    x = 11.75

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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.