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Finding the Fourth Proportional to 11.42, 15.78 and 9.38

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Solution

The fourth proportional to 11.42, 15.78 and 9.38 is: 12.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.42 : 15.78 = 9.38 : x
  2. Step 2: Convert to fraction form
    11.42/15.78 = 9.38/x
  3. Step 3: Cross multiply
    11.42x = 15.78 × 9.38
  4. Step 4: Simplify right side
    11.42x = 148.02
  5. Step 5: Solve for x
    x = 148.02/11.42
  6. Step 6: Final answer
    x = 12.96

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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.