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Finding the Fourth Proportional to 574.21, 859.78 and 391.96

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Solution

The fourth proportional to 574.21, 859.78 and 391.96 is: 586.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.21 : 859.78 = 391.96 : x
  2. Step 2: Convert to fraction form
    574.21/859.78 = 391.96/x
  3. Step 3: Cross multiply
    574.21x = 859.78 × 391.96
  4. Step 4: Simplify right side
    574.21x = 336,999.37
  5. Step 5: Solve for x
    x = 336,999.37/574.21
  6. Step 6: Final answer
    x = 586.89

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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.