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Finding the Fourth Proportional to 553.50, 763.83 and 320.63

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Solution

The fourth proportional to 553.50, 763.83 and 320.63 is: 442.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.50 : 763.83 = 320.63 : x
  2. Step 2: Convert to fraction form
    553.50/763.83 = 320.63/x
  3. Step 3: Cross multiply
    553.50x = 763.83 × 320.63
  4. Step 4: Simplify right side
    553.50x = 244,902.99
  5. Step 5: Solve for x
    x = 244,902.99/553.50
  6. Step 6: Final answer
    x = 442.46

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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.