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Finding the Fourth Proportional to 163.89, 245.60 and 86.78

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Solution

The fourth proportional to 163.89, 245.60 and 86.78 is: 130.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.89 : 245.60 = 86.78 : x
  2. Step 2: Convert to fraction form
    163.89/245.60 = 86.78/x
  3. Step 3: Cross multiply
    163.89x = 245.60 × 86.78
  4. Step 4: Simplify right side
    163.89x = 21,313.67
  5. Step 5: Solve for x
    x = 21,313.67/163.89
  6. Step 6: Final answer
    x = 130.05

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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.