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Finding the Fourth Proportional to 389, 536.90 and 249.18

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Solution

The fourth proportional to 389, 536.90 and 249.18 is: 343.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    389 : 536.90 = 249.18 : x
  2. Step 2: Convert to fraction form
    389/536.90 = 249.18/x
  3. Step 3: Cross multiply
    389x = 536.90 × 249.18
  4. Step 4: Simplify right side
    389x = 133,780.81
  5. Step 5: Solve for x
    x = 133,780.81/389
  6. Step 6: Final answer
    x = 343.91

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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.