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Finding the Fourth Proportional to 3,145.68, 4,713.60 and 1,989

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Solution

The fourth proportional to 3,145.68, 4,713.60 and 1,989 is: 2,980.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,145.68 : 4,713.60 = 1,989 : x
  2. Step 2: Convert to fraction form
    3,145.68/4,713.60 = 1,989/x
  3. Step 3: Cross multiply
    3,145.68x = 4,713.60 × 1,989
  4. Step 4: Simplify right side
    3,145.68x = 9,375,350.40
  5. Step 5: Solve for x
    x = 9,375,350.40/3,145.68
  6. Step 6: Final answer
    x = 2,980.39

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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.