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Finding the Fourth Proportional to 3,986.53, 5,980.71 and 1,213.60

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Solution

The fourth proportional to 3,986.53, 5,980.71 and 1,213.60 is: 1,820.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.53 : 5,980.71 = 1,213.60 : x
  2. Step 2: Convert to fraction form
    3,986.53/5,980.71 = 1,213.60/x
  3. Step 3: Cross multiply
    3,986.53x = 5,980.71 × 1,213.60
  4. Step 4: Simplify right side
    3,986.53x = 7,258,189.66
  5. Step 5: Solve for x
    x = 7,258,189.66/3,986.53
  6. Step 6: Final answer
    x = 1,820.68

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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.