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Finding the Fourth Proportional to 109.88, 163.70 and 105.56

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Solution

The fourth proportional to 109.88, 163.70 and 105.56 is: 157.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.88 : 163.70 = 105.56 : x
  2. Step 2: Convert to fraction form
    109.88/163.70 = 105.56/x
  3. Step 3: Cross multiply
    109.88x = 163.70 × 105.56
  4. Step 4: Simplify right side
    109.88x = 17,280.17
  5. Step 5: Solve for x
    x = 17,280.17/109.88
  6. Step 6: Final answer
    x = 157.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.