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Finding the Fourth Proportional to 9.86, 13.58 and 9

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Solution

The fourth proportional to 9.86, 13.58 and 9 is: 12.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.86 : 13.58 = 9 : x
  2. Step 2: Convert to fraction form
    9.86/13.58 = 9/x
  3. Step 3: Cross multiply
    9.86x = 13.58 × 9
  4. Step 4: Simplify right side
    9.86x = 122.18
  5. Step 5: Solve for x
    x = 122.18/9.86
  6. Step 6: Final answer
    x = 12.39

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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.