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Finding the Fourth Proportional to 101.72, 151.96 and 79.60

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Solution

The fourth proportional to 101.72, 151.96 and 79.60 is: 118.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.72 : 151.96 = 79.60 : x
  2. Step 2: Convert to fraction form
    101.72/151.96 = 79.60/x
  3. Step 3: Cross multiply
    101.72x = 151.96 × 79.60
  4. Step 4: Simplify right side
    101.72x = 12,096.02
  5. Step 5: Solve for x
    x = 12,096.02/101.72
  6. Step 6: Final answer
    x = 118.91

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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.