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Finding the Fourth Proportional to 163.88, 245.88 and 86.79

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Solution

The fourth proportional to 163.88, 245.88 and 86.79 is: 130.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.88 : 245.88 = 86.79 : x
  2. Step 2: Convert to fraction form
    163.88/245.88 = 86.79/x
  3. Step 3: Cross multiply
    163.88x = 245.88 × 86.79
  4. Step 4: Simplify right side
    163.88x = 21,339.93
  5. Step 5: Solve for x
    x = 21,339.93/163.88
  6. Step 6: Final answer
    x = 130.22

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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.