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Finding the Fourth Proportional to 639.43, 882.18 and 418.51

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Solution

The fourth proportional to 639.43, 882.18 and 418.51 is: 577.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.43 : 882.18 = 418.51 : x
  2. Step 2: Convert to fraction form
    639.43/882.18 = 418.51/x
  3. Step 3: Cross multiply
    639.43x = 882.18 × 418.51
  4. Step 4: Simplify right side
    639.43x = 369,194.65
  5. Step 5: Solve for x
    x = 369,194.65/639.43
  6. Step 6: Final answer
    x = 577.39

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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.