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Finding the Fourth Proportional to 417.20, 620.86 and 412.88

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Solution

The fourth proportional to 417.20, 620.86 and 412.88 is: 614.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.20 : 620.86 = 412.88 : x
  2. Step 2: Convert to fraction form
    417.20/620.86 = 412.88/x
  3. Step 3: Cross multiply
    417.20x = 620.86 × 412.88
  4. Step 4: Simplify right side
    417.20x = 256,340.68
  5. Step 5: Solve for x
    x = 256,340.68/417.20
  6. Step 6: Final answer
    x = 614.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.