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Finding the Fourth Proportional to 3,987.51, 5,979.02 and 1,908.02

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Solution

The fourth proportional to 3,987.51, 5,979.02 and 1,908.02 is: 2,860.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.51 : 5,979.02 = 1,908.02 : x
  2. Step 2: Convert to fraction form
    3,987.51/5,979.02 = 1,908.02/x
  3. Step 3: Cross multiply
    3,987.51x = 5,979.02 × 1,908.02
  4. Step 4: Simplify right side
    3,987.51x = 11,408,050.31
  5. Step 5: Solve for x
    x = 11,408,050.31/3,987.51
  6. Step 6: Final answer
    x = 2,860.95

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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.