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Finding the Fourth Proportional to 11.34, 15.64 and 7.71

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Solution

The fourth proportional to 11.34, 15.64 and 7.71 is: 10.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.34 : 15.64 = 7.71 : x
  2. Step 2: Convert to fraction form
    11.34/15.64 = 7.71/x
  3. Step 3: Cross multiply
    11.34x = 15.64 × 7.71
  4. Step 4: Simplify right side
    11.34x = 120.64
  5. Step 5: Solve for x
    x = 120.64/11.34
  6. Step 6: Final answer
    x = 10.64

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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.