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Finding the Fourth Proportional to 9.40, 13.99 and 9.31

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Solution

The fourth proportional to 9.40, 13.99 and 9.31 is: 13.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.40 : 13.99 = 9.31 : x
  2. Step 2: Convert to fraction form
    9.40/13.99 = 9.31/x
  3. Step 3: Cross multiply
    9.40x = 13.99 × 9.31
  4. Step 4: Simplify right side
    9.40x = 130.25
  5. Step 5: Solve for x
    x = 130.25/9.40
  6. Step 6: Final answer
    x = 13.86

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.