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Finding the Fourth Proportional to 653.64, 980.43 and 220.80

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Solution

The fourth proportional to 653.64, 980.43 and 220.80 is: 331.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.64 : 980.43 = 220.80 : x
  2. Step 2: Convert to fraction form
    653.64/980.43 = 220.80/x
  3. Step 3: Cross multiply
    653.64x = 980.43 × 220.80
  4. Step 4: Simplify right side
    653.64x = 216,478.94
  5. Step 5: Solve for x
    x = 216,478.94/653.64
  6. Step 6: Final answer
    x = 331.19

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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.