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Finding the Fourth Proportional to 654.62, 981.91 and 221.77

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Solution

The fourth proportional to 654.62, 981.91 and 221.77 is: 332.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.62 : 981.91 = 221.77 : x
  2. Step 2: Convert to fraction form
    654.62/981.91 = 221.77/x
  3. Step 3: Cross multiply
    654.62x = 981.91 × 221.77
  4. Step 4: Simplify right side
    654.62x = 217,759.69
  5. Step 5: Solve for x
    x = 217,759.69/654.62
  6. Step 6: Final answer
    x = 332.65

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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.