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Finding the Fourth Proportional to 553.92, 764.72 and 443.20

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Solution

The fourth proportional to 553.92, 764.72 and 443.20 is: 611.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.92 : 764.72 = 443.20 : x
  2. Step 2: Convert to fraction form
    553.92/764.72 = 443.20/x
  3. Step 3: Cross multiply
    553.92x = 764.72 × 443.20
  4. Step 4: Simplify right side
    553.92x = 338,923.90
  5. Step 5: Solve for x
    x = 338,923.90/553.92
  6. Step 6: Final answer
    x = 611.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.