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Finding the Fourth Proportional to 680.20, 938.22 and 417.88

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Solution

The fourth proportional to 680.20, 938.22 and 417.88 is: 576.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.20 : 938.22 = 417.88 : x
  2. Step 2: Convert to fraction form
    680.20/938.22 = 417.88/x
  3. Step 3: Cross multiply
    680.20x = 938.22 × 417.88
  4. Step 4: Simplify right side
    680.20x = 392,063.37
  5. Step 5: Solve for x
    x = 392,063.37/680.20
  6. Step 6: Final answer
    x = 576.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.