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Finding the Fourth Proportional to 653.87, 980.79 and 191.66

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Solution

The fourth proportional to 653.87, 980.79 and 191.66 is: 287.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.87 : 980.79 = 191.66 : x
  2. Step 2: Convert to fraction form
    653.87/980.79 = 191.66/x
  3. Step 3: Cross multiply
    653.87x = 980.79 × 191.66
  4. Step 4: Simplify right side
    653.87x = 187,980.66
  5. Step 5: Solve for x
    x = 187,980.66/653.87
  6. Step 6: Final answer
    x = 287.49

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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.