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Finding the Fourth Proportional to 222.19, 306.64 and 154.91

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Solution

The fourth proportional to 222.19, 306.64 and 154.91 is: 213.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.19 : 306.64 = 154.91 : x
  2. Step 2: Convert to fraction form
    222.19/306.64 = 154.91/x
  3. Step 3: Cross multiply
    222.19x = 306.64 × 154.91
  4. Step 4: Simplify right side
    222.19x = 47,501.69
  5. Step 5: Solve for x
    x = 47,501.69/222.19
  6. Step 6: Final answer
    x = 213.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.