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Finding the Fourth Proportional to 639.18, 881.84 and 418.25

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Solution

The fourth proportional to 639.18, 881.84 and 418.25 is: 577.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.18 : 881.84 = 418.25 : x
  2. Step 2: Convert to fraction form
    639.18/881.84 = 418.25/x
  3. Step 3: Cross multiply
    639.18x = 881.84 × 418.25
  4. Step 4: Simplify right side
    639.18x = 368,832.83
  5. Step 5: Solve for x
    x = 368,832.83/639.18
  6. Step 6: Final answer
    x = 577.04

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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.