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Finding the Fourth Proportional to 13.10, 19.66 and 8.60

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Solution

The fourth proportional to 13.10, 19.66 and 8.60 is: 12.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.10 : 19.66 = 8.60 : x
  2. Step 2: Convert to fraction form
    13.10/19.66 = 8.60/x
  3. Step 3: Cross multiply
    13.10x = 19.66 × 8.60
  4. Step 4: Simplify right side
    13.10x = 169.08
  5. Step 5: Solve for x
    x = 169.08/13.10
  6. Step 6: Final answer
    x = 12.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.