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Finding the Fourth Proportional to 11.51, 15.89 and 7.88

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Solution

The fourth proportional to 11.51, 15.89 and 7.88 is: 10.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.51 : 15.89 = 7.88 : x
  2. Step 2: Convert to fraction form
    11.51/15.89 = 7.88/x
  3. Step 3: Cross multiply
    11.51x = 15.89 × 7.88
  4. Step 4: Simplify right side
    11.51x = 125.09
  5. Step 5: Solve for x
    x = 125.09/11.51
  6. Step 6: Final answer
    x = 10.87

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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.