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Finding the Fourth Proportional to 653.94, 980.60 and 220.79

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Solution

The fourth proportional to 653.94, 980.60 and 220.79 is: 331.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.94 : 980.60 = 220.79 : x
  2. Step 2: Convert to fraction form
    653.94/980.60 = 220.79/x
  3. Step 3: Cross multiply
    653.94x = 980.60 × 220.79
  4. Step 4: Simplify right side
    653.94x = 216,506.67
  5. Step 5: Solve for x
    x = 216,506.67/653.94
  6. Step 6: Final answer
    x = 331.08

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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.