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Finding the Fourth Proportional to 2,120.28, 3,180 and 659.08

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Solution

The fourth proportional to 2,120.28, 3,180 and 659.08 is: 988.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.28 : 3,180 = 659.08 : x
  2. Step 2: Convert to fraction form
    2,120.28/3,180 = 659.08/x
  3. Step 3: Cross multiply
    2,120.28x = 3,180 × 659.08
  4. Step 4: Simplify right side
    2,120.28x = 2,095,874.40
  5. Step 5: Solve for x
    x = 2,095,874.40/2,120.28
  6. Step 6: Final answer
    x = 988.49

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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.