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Finding the Fourth Proportional to 1,489.43, 2,234.32 and 393.80

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Solution

The fourth proportional to 1,489.43, 2,234.32 and 393.80 is: 590.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.43 : 2,234.32 = 393.80 : x
  2. Step 2: Convert to fraction form
    1,489.43/2,234.32 = 393.80/x
  3. Step 3: Cross multiply
    1,489.43x = 2,234.32 × 393.80
  4. Step 4: Simplify right side
    1,489.43x = 879,875.22
  5. Step 5: Solve for x
    x = 879,875.22/1,489.43
  6. Step 6: Final answer
    x = 590.75

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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.