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Finding the Fourth Proportional to 3,986.68, 5,980.60 and 1,389

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Solution

The fourth proportional to 3,986.68, 5,980.60 and 1,389 is: 2,083.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.68 : 5,980.60 = 1,389 : x
  2. Step 2: Convert to fraction form
    3,986.68/5,980.60 = 1,389/x
  3. Step 3: Cross multiply
    3,986.68x = 5,980.60 × 1,389
  4. Step 4: Simplify right side
    3,986.68x = 8,307,053.40
  5. Step 5: Solve for x
    x = 8,307,053.40/3,986.68
  6. Step 6: Final answer
    x = 2,083.70

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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.