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Finding the Fourth Proportional to 553.71, 764.10 and 320.79

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Solution

The fourth proportional to 553.71, 764.10 and 320.79 is: 442.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.71 : 764.10 = 320.79 : x
  2. Step 2: Convert to fraction form
    553.71/764.10 = 320.79/x
  3. Step 3: Cross multiply
    553.71x = 764.10 × 320.79
  4. Step 4: Simplify right side
    553.71x = 245,115.64
  5. Step 5: Solve for x
    x = 245,115.64/553.71
  6. Step 6: Final answer
    x = 442.68

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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.