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Finding the Fourth Proportional to 11.50, 15.88 and 7.18

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Solution

The fourth proportional to 11.50, 15.88 and 7.18 is: 9.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.50 : 15.88 = 7.18 : x
  2. Step 2: Convert to fraction form
    11.50/15.88 = 7.18/x
  3. Step 3: Cross multiply
    11.50x = 15.88 × 7.18
  4. Step 4: Simplify right side
    11.50x = 114.02
  5. Step 5: Solve for x
    x = 114.02/11.50
  6. Step 6: Final answer
    x = 9.91

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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.