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Finding the Fourth Proportional to 425.50, 587.21 and 238.98

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Solution

The fourth proportional to 425.50, 587.21 and 238.98 is: 329.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.50 : 587.21 = 238.98 : x
  2. Step 2: Convert to fraction form
    425.50/587.21 = 238.98/x
  3. Step 3: Cross multiply
    425.50x = 587.21 × 238.98
  4. Step 4: Simplify right side
    425.50x = 140,333.80
  5. Step 5: Solve for x
    x = 140,333.80/425.50
  6. Step 6: Final answer
    x = 329.81

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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.