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Finding the Fourth Proportional to 654.45, 981.64 and 221.60

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Solution

The fourth proportional to 654.45, 981.64 and 221.60 is: 332.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.45 : 981.64 = 221.60 : x
  2. Step 2: Convert to fraction form
    654.45/981.64 = 221.60/x
  3. Step 3: Cross multiply
    654.45x = 981.64 × 221.60
  4. Step 4: Simplify right side
    654.45x = 217,534.78
  5. Step 5: Solve for x
    x = 217,534.78/654.45
  6. Step 6: Final answer
    x = 332.40

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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.