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Finding the Fourth Proportional to 224.20, 336.18 and 77.90

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Solution

The fourth proportional to 224.20, 336.18 and 77.90 is: 116.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    224.20 : 336.18 = 77.90 : x
  2. Step 2: Convert to fraction form
    224.20/336.18 = 77.90/x
  3. Step 3: Cross multiply
    224.20x = 336.18 × 77.90
  4. Step 4: Simplify right side
    224.20x = 26,187.03
  5. Step 5: Solve for x
    x = 26,187.03/224.20
  6. Step 6: Final answer
    x = 116.80

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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.