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Finding the Fourth Proportional to 418.69, 625.40 and 411

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Solution

The fourth proportional to 418.69, 625.40 and 411 is: 613.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.69 : 625.40 = 411 : x
  2. Step 2: Convert to fraction form
    418.69/625.40 = 411/x
  3. Step 3: Cross multiply
    418.69x = 625.40 × 411
  4. Step 4: Simplify right side
    418.69x = 257,039.40
  5. Step 5: Solve for x
    x = 257,039.40/418.69
  6. Step 6: Final answer
    x = 613.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.