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Finding the Fourth Proportional to 9.40, 14.14 and 8.78

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Solution

The fourth proportional to 9.40, 14.14 and 8.78 is: 13.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.40 : 14.14 = 8.78 : x
  2. Step 2: Convert to fraction form
    9.40/14.14 = 8.78/x
  3. Step 3: Cross multiply
    9.40x = 14.14 × 8.78
  4. Step 4: Simplify right side
    9.40x = 124.15
  5. Step 5: Solve for x
    x = 124.15/9.40
  6. Step 6: Final answer
    x = 13.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.