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Finding the Fourth Proportional to 222.79, 334.20 and 78.46

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Solution

The fourth proportional to 222.79, 334.20 and 78.46 is: 117.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.79 : 334.20 = 78.46 : x
  2. Step 2: Convert to fraction form
    222.79/334.20 = 78.46/x
  3. Step 3: Cross multiply
    222.79x = 334.20 × 78.46
  4. Step 4: Simplify right side
    222.79x = 26,221.33
  5. Step 5: Solve for x
    x = 26,221.33/222.79
  6. Step 6: Final answer
    x = 117.70

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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.