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Finding the Fourth Proportional to 223.20, 334.58 and 78.80

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Solution

The fourth proportional to 223.20, 334.58 and 78.80 is: 118.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    223.20 : 334.58 = 78.80 : x
  2. Step 2: Convert to fraction form
    223.20/334.58 = 78.80/x
  3. Step 3: Cross multiply
    223.20x = 334.58 × 78.80
  4. Step 4: Simplify right side
    223.20x = 26,364.90
  5. Step 5: Solve for x
    x = 26,364.90/223.20
  6. Step 6: Final answer
    x = 118.12

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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.