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Finding the Fourth Proportional to 859.43, 1,288.68 and 396.80

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Solution

The fourth proportional to 859.43, 1,288.68 and 396.80 is: 594.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    859.43 : 1,288.68 = 396.80 : x
  2. Step 2: Convert to fraction form
    859.43/1,288.68 = 396.80/x
  3. Step 3: Cross multiply
    859.43x = 1,288.68 × 396.80
  4. Step 4: Simplify right side
    859.43x = 511,341.78
  5. Step 5: Solve for x
    x = 511,341.78/859.43
  6. Step 6: Final answer
    x = 594.98

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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.