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Finding the Fourth Proportional to 393.86, 590.81 and 137.38

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Solution

The fourth proportional to 393.86, 590.81 and 137.38 is: 206.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.86 : 590.81 = 137.38 : x
  2. Step 2: Convert to fraction form
    393.86/590.81 = 137.38/x
  3. Step 3: Cross multiply
    393.86x = 590.81 × 137.38
  4. Step 4: Simplify right side
    393.86x = 81,165.48
  5. Step 5: Solve for x
    x = 81,165.48/393.86
  6. Step 6: Final answer
    x = 206.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.