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Finding the Fourth Proportional to 325.19, 487.79 and 142.60

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Solution

The fourth proportional to 325.19, 487.79 and 142.60 is: 213.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.19 : 487.79 = 142.60 : x
  2. Step 2: Convert to fraction form
    325.19/487.79 = 142.60/x
  3. Step 3: Cross multiply
    325.19x = 487.79 × 142.60
  4. Step 4: Simplify right side
    325.19x = 69,558.85
  5. Step 5: Solve for x
    x = 69,558.85/325.19
  6. Step 6: Final answer
    x = 213.90

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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.