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Finding the Fourth Proportional to 412.50, 618.42 and 217.28

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Solution

The fourth proportional to 412.50, 618.42 and 217.28 is: 325.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.50 : 618.42 = 217.28 : x
  2. Step 2: Convert to fraction form
    412.50/618.42 = 217.28/x
  3. Step 3: Cross multiply
    412.50x = 618.42 × 217.28
  4. Step 4: Simplify right side
    412.50x = 134,370.30
  5. Step 5: Solve for x
    x = 134,370.30/412.50
  6. Step 6: Final answer
    x = 325.75

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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.