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Finding the Fourth Proportional to 108.74, 150.09 and 79.28

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Solution

The fourth proportional to 108.74, 150.09 and 79.28 is: 109.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.74 : 150.09 = 79.28 : x
  2. Step 2: Convert to fraction form
    108.74/150.09 = 79.28/x
  3. Step 3: Cross multiply
    108.74x = 150.09 × 79.28
  4. Step 4: Simplify right side
    108.74x = 11,898.98
  5. Step 5: Solve for x
    x = 11,898.98/108.74
  6. Step 6: Final answer
    x = 109.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.