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Finding the Fourth Proportional to 880.18, 1,215.21 and 618.82

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Solution

The fourth proportional to 880.18, 1,215.21 and 618.82 is: 854.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.18 : 1,215.21 = 618.82 : x
  2. Step 2: Convert to fraction form
    880.18/1,215.21 = 618.82/x
  3. Step 3: Cross multiply
    880.18x = 1,215.21 × 618.82
  4. Step 4: Simplify right side
    880.18x = 751,996.25
  5. Step 5: Solve for x
    x = 751,996.25/880.18
  6. Step 6: Final answer
    x = 854.37

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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.