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Finding the Fourth Proportional to 3,686.68, 5,087.91 and 2,115.28

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Solution

The fourth proportional to 3,686.68, 5,087.91 and 2,115.28 is: 2,919.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,686.68 : 5,087.91 = 2,115.28 : x
  2. Step 2: Convert to fraction form
    3,686.68/5,087.91 = 2,115.28/x
  3. Step 3: Cross multiply
    3,686.68x = 5,087.91 × 2,115.28
  4. Step 4: Simplify right side
    3,686.68x = 10,762,354.26
  5. Step 5: Solve for x
    x = 10,762,354.26/3,686.68
  6. Step 6: Final answer
    x = 2,919.25

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.