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Finding the Fourth Proportional to 1,998.60, 3,004.38 and 1,988.88

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Solution

The fourth proportional to 1,998.60, 3,004.38 and 1,988.88 is: 2,989.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.60 : 3,004.38 = 1,988.88 : x
  2. Step 2: Convert to fraction form
    1,998.60/3,004.38 = 1,988.88/x
  3. Step 3: Cross multiply
    1,998.60x = 3,004.38 × 1,988.88
  4. Step 4: Simplify right side
    1,998.60x = 5,975,351.29
  5. Step 5: Solve for x
    x = 5,975,351.29/1,998.60
  6. Step 6: Final answer
    x = 2,989.77

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1.5x scale

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.