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Finding the Fourth Proportional to 412.72, 618.80 and 217.66

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Solution

The fourth proportional to 412.72, 618.80 and 217.66 is: 326.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.72 : 618.80 = 217.66 : x
  2. Step 2: Convert to fraction form
    412.72/618.80 = 217.66/x
  3. Step 3: Cross multiply
    412.72x = 618.80 × 217.66
  4. Step 4: Simplify right side
    412.72x = 134,688.01
  5. Step 5: Solve for x
    x = 134,688.01/412.72
  6. Step 6: Final answer
    x = 326.34

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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.