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Finding the Fourth Proportional to 10.91, 15.05 and 6.59

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Solution

The fourth proportional to 10.91, 15.05 and 6.59 is: 9.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.91 : 15.05 = 6.59 : x
  2. Step 2: Convert to fraction form
    10.91/15.05 = 6.59/x
  3. Step 3: Cross multiply
    10.91x = 15.05 × 6.59
  4. Step 4: Simplify right side
    10.91x = 99.18
  5. Step 5: Solve for x
    x = 99.18/10.91
  6. Step 6: Final answer
    x = 9.09

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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.