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Finding the Fourth Proportional to 109.54, 163.95 and 75.16

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Solution

The fourth proportional to 109.54, 163.95 and 75.16 is: 112.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.54 : 163.95 = 75.16 : x
  2. Step 2: Convert to fraction form
    109.54/163.95 = 75.16/x
  3. Step 3: Cross multiply
    109.54x = 163.95 × 75.16
  4. Step 4: Simplify right side
    109.54x = 12,322.48
  5. Step 5: Solve for x
    x = 12,322.48/109.54
  6. Step 6: Final answer
    x = 112.49

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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.