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Finding the Fourth Proportional to 664.61, 991.06 and 618.44

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Solution

The fourth proportional to 664.61, 991.06 and 618.44 is: 922.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.61 : 991.06 = 618.44 : x
  2. Step 2: Convert to fraction form
    664.61/991.06 = 618.44/x
  3. Step 3: Cross multiply
    664.61x = 991.06 × 618.44
  4. Step 4: Simplify right side
    664.61x = 612,911.15
  5. Step 5: Solve for x
    x = 612,911.15/664.61
  6. Step 6: Final answer
    x = 922.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.