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Finding the Fourth Proportional to 553.28, 763.62 and 320.54

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Solution

The fourth proportional to 553.28, 763.62 and 320.54 is: 442.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.28 : 763.62 = 320.54 : x
  2. Step 2: Convert to fraction form
    553.28/763.62 = 320.54/x
  3. Step 3: Cross multiply
    553.28x = 763.62 × 320.54
  4. Step 4: Simplify right side
    553.28x = 244,770.75
  5. Step 5: Solve for x
    x = 244,770.75/553.28
  6. Step 6: Final answer
    x = 442.40

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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.