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Finding the Fourth Proportional to 553.21, 764.16 and 387.97

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Solution

The fourth proportional to 553.21, 764.16 and 387.97 is: 535.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.21 : 764.16 = 387.97 : x
  2. Step 2: Convert to fraction form
    553.21/764.16 = 387.97/x
  3. Step 3: Cross multiply
    553.21x = 764.16 × 387.97
  4. Step 4: Simplify right side
    553.21x = 296,471.16
  5. Step 5: Solve for x
    x = 296,471.16/553.21
  6. Step 6: Final answer
    x = 535.91

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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.