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Finding the Fourth Proportional to 10.91, 15.05 and 9.07

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Solution

The fourth proportional to 10.91, 15.05 and 9.07 is: 12.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.91 : 15.05 = 9.07 : x
  2. Step 2: Convert to fraction form
    10.91/15.05 = 9.07/x
  3. Step 3: Cross multiply
    10.91x = 15.05 × 9.07
  4. Step 4: Simplify right side
    10.91x = 136.38
  5. Step 5: Solve for x
    x = 136.38/10.91
  6. Step 6: Final answer
    x = 12.50

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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.