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Finding the Fourth Proportional to 9.27, 12.80 and 5.64

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Solution

The fourth proportional to 9.27, 12.80 and 5.64 is: 7.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.27 : 12.80 = 5.64 : x
  2. Step 2: Convert to fraction form
    9.27/12.80 = 5.64/x
  3. Step 3: Cross multiply
    9.27x = 12.80 × 5.64
  4. Step 4: Simplify right side
    9.27x = 72.14
  5. Step 5: Solve for x
    x = 72.14/9.27
  6. Step 6: Final answer
    x = 7.78

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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.