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Finding the Fourth Proportional to 486.62, 672.39 and 389.18

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Solution

The fourth proportional to 486.62, 672.39 and 389.18 is: 537.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.62 : 672.39 = 389.18 : x
  2. Step 2: Convert to fraction form
    486.62/672.39 = 389.18/x
  3. Step 3: Cross multiply
    486.62x = 672.39 × 389.18
  4. Step 4: Simplify right side
    486.62x = 261,680.74
  5. Step 5: Solve for x
    x = 261,680.74/486.62
  6. Step 6: Final answer
    x = 537.75

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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.