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Finding the Fourth Proportional to 109.15, 163.65 and 51.39

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Solution

The fourth proportional to 109.15, 163.65 and 51.39 is: 77.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.15 : 163.65 = 51.39 : x
  2. Step 2: Convert to fraction form
    109.15/163.65 = 51.39/x
  3. Step 3: Cross multiply
    109.15x = 163.65 × 51.39
  4. Step 4: Simplify right side
    109.15x = 8,409.97
  5. Step 5: Solve for x
    x = 8,409.97/109.15
  6. Step 6: Final answer
    x = 77.05

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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.