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Finding the Fourth Proportional to 418.58, 578.19 and 287.36

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Solution

The fourth proportional to 418.58, 578.19 and 287.36 is: 396.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.58 : 578.19 = 287.36 : x
  2. Step 2: Convert to fraction form
    418.58/578.19 = 287.36/x
  3. Step 3: Cross multiply
    418.58x = 578.19 × 287.36
  4. Step 4: Simplify right side
    418.58x = 166,148.68
  5. Step 5: Solve for x
    x = 166,148.68/418.58
  6. Step 6: Final answer
    x = 396.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.