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Finding the Fourth Proportional to 416.69, 624.81 and 128.09

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Solution

The fourth proportional to 416.69, 624.81 and 128.09 is: 192.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.69 : 624.81 = 128.09 : x
  2. Step 2: Convert to fraction form
    416.69/624.81 = 128.09/x
  3. Step 3: Cross multiply
    416.69x = 624.81 × 128.09
  4. Step 4: Simplify right side
    416.69x = 80,031.91
  5. Step 5: Solve for x
    x = 80,031.91/416.69
  6. Step 6: Final answer
    x = 192.07

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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.