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Finding the Fourth Proportional to 572.78, 790.44 and 320.73

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Solution

The fourth proportional to 572.78, 790.44 and 320.73 is: 442.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.78 : 790.44 = 320.73 : x
  2. Step 2: Convert to fraction form
    572.78/790.44 = 320.73/x
  3. Step 3: Cross multiply
    572.78x = 790.44 × 320.73
  4. Step 4: Simplify right side
    572.78x = 253,517.82
  5. Step 5: Solve for x
    x = 253,517.82/572.78
  6. Step 6: Final answer
    x = 442.61

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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.