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Finding the Fourth Proportional to 654, 981 and 221.16

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Solution

The fourth proportional to 654, 981 and 221.16 is: 331.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    654 : 981 = 221.16 : x
  2. Step 2: Convert to fraction form
    654/981 = 221.16/x
  3. Step 3: Cross multiply
    654x = 981 × 221.16
  4. Step 4: Simplify right side
    654x = 216,957.96
  5. Step 5: Solve for x
    x = 216,957.96/654
  6. Step 6: Final answer
    x = 331.74

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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.