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Finding the Fourth Proportional to 13.04, 18 and 7.86

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Solution

The fourth proportional to 13.04, 18 and 7.86 is: 10.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.04 : 18 = 7.86 : x
  2. Step 2: Convert to fraction form
    13.04/18 = 7.86/x
  3. Step 3: Cross multiply
    13.04x = 18 × 7.86
  4. Step 4: Simplify right side
    13.04x = 141.48
  5. Step 5: Solve for x
    x = 141.48/13.04
  6. Step 6: Final answer
    x = 10.85

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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.