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Finding the Fourth Proportional to 120.62, 180.93 and 77.31

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Solution

The fourth proportional to 120.62, 180.93 and 77.31 is: 115.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.62 : 180.93 = 77.31 : x
  2. Step 2: Convert to fraction form
    120.62/180.93 = 77.31/x
  3. Step 3: Cross multiply
    120.62x = 180.93 × 77.31
  4. Step 4: Simplify right side
    120.62x = 13,987.02
  5. Step 5: Solve for x
    x = 13,987.02/120.62
  6. Step 6: Final answer
    x = 115.96

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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.