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Finding the Fourth Proportional to 325.50, 488.11 and 142.91

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Solution

The fourth proportional to 325.50, 488.11 and 142.91 is: 214.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.50 : 488.11 = 142.91 : x
  2. Step 2: Convert to fraction form
    325.50/488.11 = 142.91/x
  3. Step 3: Cross multiply
    325.50x = 488.11 × 142.91
  4. Step 4: Simplify right side
    325.50x = 69,755.80
  5. Step 5: Solve for x
    x = 69,755.80/325.50
  6. Step 6: Final answer
    x = 214.30

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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.