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Finding the Fourth Proportional to 109.22, 151.56 and 105.39

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Solution

The fourth proportional to 109.22, 151.56 and 105.39 is: 146.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.22 : 151.56 = 105.39 : x
  2. Step 2: Convert to fraction form
    109.22/151.56 = 105.39/x
  3. Step 3: Cross multiply
    109.22x = 151.56 × 105.39
  4. Step 4: Simplify right side
    109.22x = 15,972.91
  5. Step 5: Solve for x
    x = 15,972.91/109.22
  6. Step 6: Final answer
    x = 146.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.