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Finding the Fourth Proportional to 574.82, 860.88 and 420.36

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Solution

The fourth proportional to 574.82, 860.88 and 420.36 is: 629.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.82 : 860.88 = 420.36 : x
  2. Step 2: Convert to fraction form
    574.82/860.88 = 420.36/x
  3. Step 3: Cross multiply
    574.82x = 860.88 × 420.36
  4. Step 4: Simplify right side
    574.82x = 361,879.52
  5. Step 5: Solve for x
    x = 361,879.52/574.82
  6. Step 6: Final answer
    x = 629.56

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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.