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Finding the Fourth Proportional to 9.28, 13.90 and 5

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Solution

The fourth proportional to 9.28, 13.90 and 5 is: 7.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.28 : 13.90 = 5 : x
  2. Step 2: Convert to fraction form
    9.28/13.90 = 5/x
  3. Step 3: Cross multiply
    9.28x = 13.90 × 5
  4. Step 4: Simplify right side
    9.28x = 69.50
  5. Step 5: Solve for x
    x = 69.50/9.28
  6. Step 6: Final answer
    x = 7.49

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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.