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Finding the Fourth Proportional to 417.96, 626.90 and 129.38

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Solution

The fourth proportional to 417.96, 626.90 and 129.38 is: 194.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.96 : 626.90 = 129.38 : x
  2. Step 2: Convert to fraction form
    417.96/626.90 = 129.38/x
  3. Step 3: Cross multiply
    417.96x = 626.90 × 129.38
  4. Step 4: Simplify right side
    417.96x = 81,104.54
  5. Step 5: Solve for x
    x = 81,104.54/417.96
  6. Step 6: Final answer
    x = 194.05

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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.