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Finding the Fourth Proportional to 10.86, 15.06 and 9.66

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Solution

The fourth proportional to 10.86, 15.06 and 9.66 is: 13.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.86 : 15.06 = 9.66 : x
  2. Step 2: Convert to fraction form
    10.86/15.06 = 9.66/x
  3. Step 3: Cross multiply
    10.86x = 15.06 × 9.66
  4. Step 4: Simplify right side
    10.86x = 145.48
  5. Step 5: Solve for x
    x = 145.48/10.86
  6. Step 6: Final answer
    x = 13.40

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.