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Finding the Fourth Proportional to 654, 980.66 and 221

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Solution

The fourth proportional to 654, 980.66 and 221 is: 331.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    654 : 980.66 = 221 : x
  2. Step 2: Convert to fraction form
    654/980.66 = 221/x
  3. Step 3: Cross multiply
    654x = 980.66 × 221
  4. Step 4: Simplify right side
    654x = 216,725.86
  5. Step 5: Solve for x
    x = 216,725.86/654
  6. Step 6: Final answer
    x = 331.39

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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.