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Finding the Fourth Proportional to 222.98, 334.45 and 78.68

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Solution

The fourth proportional to 222.98, 334.45 and 78.68 is: 118.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.98 : 334.45 = 78.68 : x
  2. Step 2: Convert to fraction form
    222.98/334.45 = 78.68/x
  3. Step 3: Cross multiply
    222.98x = 334.45 × 78.68
  4. Step 4: Simplify right side
    222.98x = 26,314.53
  5. Step 5: Solve for x
    x = 26,314.53/222.98
  6. Step 6: Final answer
    x = 118.01

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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.