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Finding the Fourth Proportional to 574.80, 860.91 and 391.38

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Solution

The fourth proportional to 574.80, 860.91 and 391.38 is: 586.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.80 : 860.91 = 391.38 : x
  2. Step 2: Convert to fraction form
    574.80/860.91 = 391.38/x
  3. Step 3: Cross multiply
    574.80x = 860.91 × 391.38
  4. Step 4: Simplify right side
    574.80x = 336,942.96
  5. Step 5: Solve for x
    x = 336,942.96/574.80
  6. Step 6: Final answer
    x = 586.19

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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.