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Finding the Fourth Proportional to 9.10, 11.90 and 9.10

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Solution

The fourth proportional to 9.10, 11.90 and 9.10 is: 11.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.10 : 11.90 = 9.10 : x
  2. Step 2: Convert to fraction form
    9.10/11.90 = 9.10/x
  3. Step 3: Cross multiply
    9.10x = 11.90 × 9.10
  4. Step 4: Simplify right side
    9.10x = 108.29
  5. Step 5: Solve for x
    x = 108.29/9.10
  6. Step 6: Final answer
    x = 11.90

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.