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Finding the Fourth Proportional to 653.40, 980.28 and 191.22

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Solution

The fourth proportional to 653.40, 980.28 and 191.22 is: 286.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.40 : 980.28 = 191.22 : x
  2. Step 2: Convert to fraction form
    653.40/980.28 = 191.22/x
  3. Step 3: Cross multiply
    653.40x = 980.28 × 191.22
  4. Step 4: Simplify right side
    653.40x = 187,449.14
  5. Step 5: Solve for x
    x = 187,449.14/653.40
  6. Step 6: Final answer
    x = 286.88

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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.