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Finding the Fourth Proportional to 77.80, 116.60 and 41.20

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Solution

The fourth proportional to 77.80, 116.60 and 41.20 is: 61.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.80 : 116.60 = 41.20 : x
  2. Step 2: Convert to fraction form
    77.80/116.60 = 41.20/x
  3. Step 3: Cross multiply
    77.80x = 116.60 × 41.20
  4. Step 4: Simplify right side
    77.80x = 4,803.92
  5. Step 5: Solve for x
    x = 4,803.92/77.80
  6. Step 6: Final answer
    x = 61.75

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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.