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Finding the Fourth Proportional to 425.25, 587.09 and 321.57

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Solution

The fourth proportional to 425.25, 587.09 and 321.57 is: 443.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.25 : 587.09 = 321.57 : x
  2. Step 2: Convert to fraction form
    425.25/587.09 = 321.57/x
  3. Step 3: Cross multiply
    425.25x = 587.09 × 321.57
  4. Step 4: Simplify right side
    425.25x = 188,790.53
  5. Step 5: Solve for x
    x = 188,790.53/425.25
  6. Step 6: Final answer
    x = 443.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.