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Finding the Fourth Proportional to 553.31, 763.67 and 320.44

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Solution

The fourth proportional to 553.31, 763.67 and 320.44 is: 442.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.31 : 763.67 = 320.44 : x
  2. Step 2: Convert to fraction form
    553.31/763.67 = 320.44/x
  3. Step 3: Cross multiply
    553.31x = 763.67 × 320.44
  4. Step 4: Simplify right side
    553.31x = 244,709.31
  5. Step 5: Solve for x
    x = 244,709.31/553.31
  6. Step 6: Final answer
    x = 442.26

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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.