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Finding the Fourth Proportional to 417.57, 626.45 and 129

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Solution

The fourth proportional to 417.57, 626.45 and 129 is: 193.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.57 : 626.45 = 129 : x
  2. Step 2: Convert to fraction form
    417.57/626.45 = 129/x
  3. Step 3: Cross multiply
    417.57x = 626.45 × 129
  4. Step 4: Simplify right side
    417.57x = 80,811.41
  5. Step 5: Solve for x
    x = 80,811.41/417.57
  6. Step 6: Final answer
    x = 193.53

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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.