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Finding the Fourth Proportional to 493.19, 679.19 and 399.33

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Solution

The fourth proportional to 493.19, 679.19 and 399.33 is: 549.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.19 : 679.19 = 399.33 : x
  2. Step 2: Convert to fraction form
    493.19/679.19 = 399.33/x
  3. Step 3: Cross multiply
    493.19x = 679.19 × 399.33
  4. Step 4: Simplify right side
    493.19x = 271,218.95
  5. Step 5: Solve for x
    x = 271,218.95/493.19
  6. Step 6: Final answer
    x = 549.93

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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.