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Finding the Fourth Proportional to 3,987.12, 5,979.99 and 1,064.75

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Solution

The fourth proportional to 3,987.12, 5,979.99 and 1,064.75 is: 1,596.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.12 : 5,979.99 = 1,064.75 : x
  2. Step 2: Convert to fraction form
    3,987.12/5,979.99 = 1,064.75/x
  3. Step 3: Cross multiply
    3,987.12x = 5,979.99 × 1,064.75
  4. Step 4: Simplify right side
    3,987.12x = 6,367,168.45
  5. Step 5: Solve for x
    x = 6,367,168.45/3,987.12
  6. Step 6: Final answer
    x = 1,596.93

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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.