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Finding the Fourth Proportional to 3,987.72, 5,984.31 and 1,390.66

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Solution

The fourth proportional to 3,987.72, 5,984.31 and 1,390.66 is: 2,086.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.72 : 5,984.31 = 1,390.66 : x
  2. Step 2: Convert to fraction form
    3,987.72/5,984.31 = 1,390.66/x
  3. Step 3: Cross multiply
    3,987.72x = 5,984.31 × 1,390.66
  4. Step 4: Simplify right side
    3,987.72x = 8,322,140.54
  5. Step 5: Solve for x
    x = 8,322,140.54/3,987.72
  6. Step 6: Final answer
    x = 2,086.94

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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.