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Finding the Fourth Proportional to 418.39, 577.49 and 287.37

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Solution

The fourth proportional to 418.39, 577.49 and 287.37 is: 396.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.39 : 577.49 = 287.37 : x
  2. Step 2: Convert to fraction form
    418.39/577.49 = 287.37/x
  3. Step 3: Cross multiply
    418.39x = 577.49 × 287.37
  4. Step 4: Simplify right side
    418.39x = 165,953.30
  5. Step 5: Solve for x
    x = 165,953.30/418.39
  6. Step 6: Final answer
    x = 396.65

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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.