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Finding the Fourth Proportional to 13.07, 18.16 and 12.91

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Solution

The fourth proportional to 13.07, 18.16 and 12.91 is: 17.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.07 : 18.16 = 12.91 : x
  2. Step 2: Convert to fraction form
    13.07/18.16 = 12.91/x
  3. Step 3: Cross multiply
    13.07x = 18.16 × 12.91
  4. Step 4: Simplify right side
    13.07x = 234.34
  5. Step 5: Solve for x
    x = 234.34/13.07
  6. Step 6: Final answer
    x = 17.93

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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.