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Finding the Fourth Proportional to 653.67, 980.57 and 220.86

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Solution

The fourth proportional to 653.67, 980.57 and 220.86 is: 331.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.67 : 980.57 = 220.86 : x
  2. Step 2: Convert to fraction form
    653.67/980.57 = 220.86/x
  3. Step 3: Cross multiply
    653.67x = 980.57 × 220.86
  4. Step 4: Simplify right side
    653.67x = 216,569.24
  5. Step 5: Solve for x
    x = 216,569.24/653.67
  6. Step 6: Final answer
    x = 331.31

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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.