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Finding the Fourth Proportional to 640.97, 888.61 and 618.44

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Solution

The fourth proportional to 640.97, 888.61 and 618.44 is: 857.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.97 : 888.61 = 618.44 : x
  2. Step 2: Convert to fraction form
    640.97/888.61 = 618.44/x
  3. Step 3: Cross multiply
    640.97x = 888.61 × 618.44
  4. Step 4: Simplify right side
    640.97x = 549,554.96
  5. Step 5: Solve for x
    x = 549,554.96/640.97
  6. Step 6: Final answer
    x = 857.39

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.