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Finding the Fourth Proportional to 417.43, 626.18 and 128.86

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Solution

The fourth proportional to 417.43, 626.18 and 128.86 is: 193.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.43 : 626.18 = 128.86 : x
  2. Step 2: Convert to fraction form
    417.43/626.18 = 128.86/x
  3. Step 3: Cross multiply
    417.43x = 626.18 × 128.86
  4. Step 4: Simplify right side
    417.43x = 80,689.55
  5. Step 5: Solve for x
    x = 80,689.55/417.43
  6. Step 6: Final answer
    x = 193.30

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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.