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Finding the Fourth Proportional to 653.96, 981.03 and 221.24

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Solution

The fourth proportional to 653.96, 981.03 and 221.24 is: 331.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.96 : 981.03 = 221.24 : x
  2. Step 2: Convert to fraction form
    653.96/981.03 = 221.24/x
  3. Step 3: Cross multiply
    653.96x = 981.03 × 221.24
  4. Step 4: Simplify right side
    653.96x = 217,043.08
  5. Step 5: Solve for x
    x = 217,043.08/653.96
  6. Step 6: Final answer
    x = 331.89

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Double scale
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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.