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Finding the Fourth Proportional to 11.16, 15.40 and 6.31

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Solution

The fourth proportional to 11.16, 15.40 and 6.31 is: 8.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.16 : 15.40 = 6.31 : x
  2. Step 2: Convert to fraction form
    11.16/15.40 = 6.31/x
  3. Step 3: Cross multiply
    11.16x = 15.40 × 6.31
  4. Step 4: Simplify right side
    11.16x = 97.08
  5. Step 5: Solve for x
    x = 97.08/11.16
  6. Step 6: Final answer
    x = 8.70

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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.