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Finding the Fourth Proportional to 553.13, 763.45 and 320.39

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Solution

The fourth proportional to 553.13, 763.45 and 320.39 is: 442.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.13 : 763.45 = 320.39 : x
  2. Step 2: Convert to fraction form
    553.13/763.45 = 320.39/x
  3. Step 3: Cross multiply
    553.13x = 763.45 × 320.39
  4. Step 4: Simplify right side
    553.13x = 244,601.75
  5. Step 5: Solve for x
    x = 244,601.75/553.13
  6. Step 6: Final answer
    x = 442.21

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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.