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Finding the Fourth Proportional to 13.07, 18.01 and 12.81

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Solution

The fourth proportional to 13.07, 18.01 and 12.81 is: 17.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.07 : 18.01 = 12.81 : x
  2. Step 2: Convert to fraction form
    13.07/18.01 = 12.81/x
  3. Step 3: Cross multiply
    13.07x = 18.01 × 12.81
  4. Step 4: Simplify right side
    13.07x = 230.71
  5. Step 5: Solve for x
    x = 230.71/13.07
  6. Step 6: Final answer
    x = 17.65

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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.