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Finding the Fourth Proportional to 417.26, 625.95 and 128.63

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Solution

The fourth proportional to 417.26, 625.95 and 128.63 is: 192.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.26 : 625.95 = 128.63 : x
  2. Step 2: Convert to fraction form
    417.26/625.95 = 128.63/x
  3. Step 3: Cross multiply
    417.26x = 625.95 × 128.63
  4. Step 4: Simplify right side
    417.26x = 80,512.82
  5. Step 5: Solve for x
    x = 80,512.82/417.26
  6. Step 6: Final answer
    x = 192.96

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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.