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Finding the Fourth Proportional to 654.59, 981.27 and 221.45

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Solution

The fourth proportional to 654.59, 981.27 and 221.45 is: 331.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.59 : 981.27 = 221.45 : x
  2. Step 2: Convert to fraction form
    654.59/981.27 = 221.45/x
  3. Step 3: Cross multiply
    654.59x = 981.27 × 221.45
  4. Step 4: Simplify right side
    654.59x = 217,297.34
  5. Step 5: Solve for x
    x = 217,297.34/654.59
  6. Step 6: Final answer
    x = 331.96

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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.