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Finding the Fourth Proportional to 416.78, 625.28 and 128.22

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Solution

The fourth proportional to 416.78, 625.28 and 128.22 is: 192.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.78 : 625.28 = 128.22 : x
  2. Step 2: Convert to fraction form
    416.78/625.28 = 128.22/x
  3. Step 3: Cross multiply
    416.78x = 625.28 × 128.22
  4. Step 4: Simplify right side
    416.78x = 80,173.40
  5. Step 5: Solve for x
    x = 80,173.40/416.78
  6. Step 6: Final answer
    x = 192.36

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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.