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Finding the Fourth Proportional to 109.28, 163.59 and 74.99

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Solution

The fourth proportional to 109.28, 163.59 and 74.99 is: 112.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.28 : 163.59 = 74.99 : x
  2. Step 2: Convert to fraction form
    109.28/163.59 = 74.99/x
  3. Step 3: Cross multiply
    109.28x = 163.59 × 74.99
  4. Step 4: Simplify right side
    109.28x = 12,266.80
  5. Step 5: Solve for x
    x = 12,266.80/109.28
  6. Step 6: Final answer
    x = 112.26

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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.