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Finding the Fourth Proportional to 493, 679.41 and 318.04

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Solution

The fourth proportional to 493, 679.41 and 318.04 is: 438.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    493 : 679.41 = 318.04 : x
  2. Step 2: Convert to fraction form
    493/679.41 = 318.04/x
  3. Step 3: Cross multiply
    493x = 679.41 × 318.04
  4. Step 4: Simplify right side
    493x = 216,079.56
  5. Step 5: Solve for x
    x = 216,079.56/493
  6. Step 6: Final answer
    x = 438.30

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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.