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Finding the Fourth Proportional to 1,866.56, 2,799.86 and 1,221.39

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Solution

The fourth proportional to 1,866.56, 2,799.86 and 1,221.39 is: 1,832.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,866.56 : 2,799.86 = 1,221.39 : x
  2. Step 2: Convert to fraction form
    1,866.56/2,799.86 = 1,221.39/x
  3. Step 3: Cross multiply
    1,866.56x = 2,799.86 × 1,221.39
  4. Step 4: Simplify right side
    1,866.56x = 3,419,714.90
  5. Step 5: Solve for x
    x = 3,419,714.90/1,866.56
  6. Step 6: Final answer
    x = 1,832.10

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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.