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Finding the Fourth Proportional to 13.61, 18.79 and 8.77

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Solution

The fourth proportional to 13.61, 18.79 and 8.77 is: 12.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.61 : 18.79 = 8.77 : x
  2. Step 2: Convert to fraction form
    13.61/18.79 = 8.77/x
  3. Step 3: Cross multiply
    13.61x = 18.79 × 8.77
  4. Step 4: Simplify right side
    13.61x = 164.69
  5. Step 5: Solve for x
    x = 164.69/13.61
  6. Step 6: Final answer
    x = 12.10

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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.