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Finding the Fourth Proportional to 553.08, 762.18 and 397.56

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Solution

The fourth proportional to 553.08, 762.18 and 397.56 is: 547.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.08 : 762.18 = 397.56 : x
  2. Step 2: Convert to fraction form
    553.08/762.18 = 397.56/x
  3. Step 3: Cross multiply
    553.08x = 762.18 × 397.56
  4. Step 4: Simplify right side
    553.08x = 303,012.28
  5. Step 5: Solve for x
    x = 303,012.28/553.08
  6. Step 6: Final answer
    x = 547.86

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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.