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Finding the Fourth Proportional to 653.75, 980.78 and 191.57

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Solution

The fourth proportional to 653.75, 980.78 and 191.57 is: 287.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.75 : 980.78 = 191.57 : x
  2. Step 2: Convert to fraction form
    653.75/980.78 = 191.57/x
  3. Step 3: Cross multiply
    653.75x = 980.78 × 191.57
  4. Step 4: Simplify right side
    653.75x = 187,890.96
  5. Step 5: Solve for x
    x = 187,890.96/653.75
  6. Step 6: Final answer
    x = 287.40

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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.