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Finding the Fourth Proportional to 553.90, 764.33 and 321

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Solution

The fourth proportional to 553.90, 764.33 and 321 is: 442.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.90 : 764.33 = 321 : x
  2. Step 2: Convert to fraction form
    553.90/764.33 = 321/x
  3. Step 3: Cross multiply
    553.90x = 764.33 × 321
  4. Step 4: Simplify right side
    553.90x = 245,349.93
  5. Step 5: Solve for x
    x = 245,349.93/553.90
  6. Step 6: Final answer
    x = 442.95

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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.