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Finding the Fourth Proportional to 416.90, 625.46 and 128.40

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Solution

The fourth proportional to 416.90, 625.46 and 128.40 is: 192.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.90 : 625.46 = 128.40 : x
  2. Step 2: Convert to fraction form
    416.90/625.46 = 128.40/x
  3. Step 3: Cross multiply
    416.90x = 625.46 × 128.40
  4. Step 4: Simplify right side
    416.90x = 80,308.42
  5. Step 5: Solve for x
    x = 80,308.42/416.90
  6. Step 6: Final answer
    x = 192.63

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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.