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Finding the Fourth Proportional to 3,866.58, 5,335.56 and 2,187.90

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Solution

The fourth proportional to 3,866.58, 5,335.56 and 2,187.90 is: 3,019.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,866.58 : 5,335.56 = 2,187.90 : x
  2. Step 2: Convert to fraction form
    3,866.58/5,335.56 = 2,187.90/x
  3. Step 3: Cross multiply
    3,866.58x = 5,335.56 × 2,187.90
  4. Step 4: Simplify right side
    3,866.58x = 11,673,671.72
  5. Step 5: Solve for x
    x = 11,673,671.72/3,866.58
  6. Step 6: Final answer
    x = 3,019.12

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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.