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Finding the Fourth Proportional to 653.93, 980.90 and 221.08

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Solution

The fourth proportional to 653.93, 980.90 and 221.08 is: 331.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.93 : 980.90 = 221.08 : x
  2. Step 2: Convert to fraction form
    653.93/980.90 = 221.08/x
  3. Step 3: Cross multiply
    653.93x = 980.90 × 221.08
  4. Step 4: Simplify right side
    653.93x = 216,857.37
  5. Step 5: Solve for x
    x = 216,857.37/653.93
  6. Step 6: Final answer
    x = 331.62

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Similar ratio
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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.