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Finding the Fourth Proportional to 101.09, 151.64 and 77.20

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Solution

The fourth proportional to 101.09, 151.64 and 77.20 is: 115.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.09 : 151.64 = 77.20 : x
  2. Step 2: Convert to fraction form
    101.09/151.64 = 77.20/x
  3. Step 3: Cross multiply
    101.09x = 151.64 × 77.20
  4. Step 4: Simplify right side
    101.09x = 11,706.61
  5. Step 5: Solve for x
    x = 11,706.61/101.09
  6. Step 6: Final answer
    x = 115.80

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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.