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Finding the Fourth Proportional to 416.87, 625.43 and 128.30

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Solution

The fourth proportional to 416.87, 625.43 and 128.30 is: 192.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.87 : 625.43 = 128.30 : x
  2. Step 2: Convert to fraction form
    416.87/625.43 = 128.30/x
  3. Step 3: Cross multiply
    416.87x = 625.43 × 128.30
  4. Step 4: Simplify right side
    416.87x = 80,243.59
  5. Step 5: Solve for x
    x = 80,243.59/416.87
  6. Step 6: Final answer
    x = 192.49

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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.