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Finding the Fourth Proportional to 10.86, 16.21 and 10.09

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Solution

The fourth proportional to 10.86, 16.21 and 10.09 is: 15.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.86 : 16.21 = 10.09 : x
  2. Step 2: Convert to fraction form
    10.86/16.21 = 10.09/x
  3. Step 3: Cross multiply
    10.86x = 16.21 × 10.09
  4. Step 4: Simplify right side
    10.86x = 163.43
  5. Step 5: Solve for x
    x = 163.43/10.86
  6. Step 6: Final answer
    x = 15.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.