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Finding the Fourth Proportional to 389.38, 536.90 and 290.97

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Solution

The fourth proportional to 389.38, 536.90 and 290.97 is: 401.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.38 : 536.90 = 290.97 : x
  2. Step 2: Convert to fraction form
    389.38/536.90 = 290.97/x
  3. Step 3: Cross multiply
    389.38x = 536.90 × 290.97
  4. Step 4: Simplify right side
    389.38x = 156,221.79
  5. Step 5: Solve for x
    x = 156,221.79/389.38
  6. Step 6: Final answer
    x = 401.21

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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.