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Finding the Fourth Proportional to 2,802.96, 4,204.89 and 855

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Solution

The fourth proportional to 2,802.96, 4,204.89 and 855 is: 1,282.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,802.96 : 4,204.89 = 855 : x
  2. Step 2: Convert to fraction form
    2,802.96/4,204.89 = 855/x
  3. Step 3: Cross multiply
    2,802.96x = 4,204.89 × 855
  4. Step 4: Simplify right side
    2,802.96x = 3,595,180.95
  5. Step 5: Solve for x
    x = 3,595,180.95/2,802.96
  6. Step 6: Final answer
    x = 1,282.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.