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Finding the Fourth Proportional to 653.44, 980.14 and 220.90

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Solution

The fourth proportional to 653.44, 980.14 and 220.90 is: 331.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.44 : 980.14 = 220.90 : x
  2. Step 2: Convert to fraction form
    653.44/980.14 = 220.90/x
  3. Step 3: Cross multiply
    653.44x = 980.14 × 220.90
  4. Step 4: Simplify right side
    653.44x = 216,512.93
  5. Step 5: Solve for x
    x = 216,512.93/653.44
  6. Step 6: Final answer
    x = 331.34

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1.5x scale

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.