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Finding the Fourth Proportional to 101.10, 151.38 and 78.09

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Solution

The fourth proportional to 101.10, 151.38 and 78.09 is: 116.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.10 : 151.38 = 78.09 : x
  2. Step 2: Convert to fraction form
    101.10/151.38 = 78.09/x
  3. Step 3: Cross multiply
    101.10x = 151.38 × 78.09
  4. Step 4: Simplify right side
    101.10x = 11,821.26
  5. Step 5: Solve for x
    x = 11,821.26/101.10
  6. Step 6: Final answer
    x = 116.93

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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.