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Finding the Fourth Proportional to 15.75, 21.74 and 9.28

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Solution

The fourth proportional to 15.75, 21.74 and 9.28 is: 12.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.75 : 21.74 = 9.28 : x
  2. Step 2: Convert to fraction form
    15.75/21.74 = 9.28/x
  3. Step 3: Cross multiply
    15.75x = 21.74 × 9.28
  4. Step 4: Simplify right side
    15.75x = 201.73
  5. Step 5: Solve for x
    x = 201.73/15.75
  6. Step 6: Final answer
    x = 12.81

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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.