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Finding the Fourth Proportional to 120.60, 180.60 and 79.80

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Solution

The fourth proportional to 120.60, 180.60 and 79.80 is: 119.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.60 : 180.60 = 79.80 : x
  2. Step 2: Convert to fraction form
    120.60/180.60 = 79.80/x
  3. Step 3: Cross multiply
    120.60x = 180.60 × 79.80
  4. Step 4: Simplify right side
    120.60x = 14,411.88
  5. Step 5: Solve for x
    x = 14,411.88/120.60
  6. Step 6: Final answer
    x = 119.50

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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.