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Finding the Fourth Proportional to 805.30, 1,208.74 and 394.73

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Solution

The fourth proportional to 805.30, 1,208.74 and 394.73 is: 592.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.30 : 1,208.74 = 394.73 : x
  2. Step 2: Convert to fraction form
    805.30/1,208.74 = 394.73/x
  3. Step 3: Cross multiply
    805.30x = 1,208.74 × 394.73
  4. Step 4: Simplify right side
    805.30x = 477,127.98
  5. Step 5: Solve for x
    x = 477,127.98/805.30
  6. Step 6: Final answer
    x = 592.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.