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Finding the Fourth Proportional to 325.50, 487.28 and 188.12

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Solution

The fourth proportional to 325.50, 487.28 and 188.12 is: 281.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.50 : 487.28 = 188.12 : x
  2. Step 2: Convert to fraction form
    325.50/487.28 = 188.12/x
  3. Step 3: Cross multiply
    325.50x = 487.28 × 188.12
  4. Step 4: Simplify right side
    325.50x = 91,667.11
  5. Step 5: Solve for x
    x = 91,667.11/325.50
  6. Step 6: Final answer
    x = 281.62

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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.