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Finding the Fourth Proportional to 1,855.78, 2,781.86 and 816.36

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Solution

The fourth proportional to 1,855.78, 2,781.86 and 816.36 is: 1,223.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,855.78 : 2,781.86 = 816.36 : x
  2. Step 2: Convert to fraction form
    1,855.78/2,781.86 = 816.36/x
  3. Step 3: Cross multiply
    1,855.78x = 2,781.86 × 816.36
  4. Step 4: Simplify right side
    1,855.78x = 2,270,999.23
  5. Step 5: Solve for x
    x = 2,270,999.23/1,855.78
  6. Step 6: Final answer
    x = 1,223.74

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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.