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Finding the Fourth Proportional to 1,984.52, 2,976.42 and 668.30

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Solution

The fourth proportional to 1,984.52, 2,976.42 and 668.30 is: 1,002.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,984.52 : 2,976.42 = 668.30 : x
  2. Step 2: Convert to fraction form
    1,984.52/2,976.42 = 668.30/x
  3. Step 3: Cross multiply
    1,984.52x = 2,976.42 × 668.30
  4. Step 4: Simplify right side
    1,984.52x = 1,989,141.49
  5. Step 5: Solve for x
    x = 1,989,141.49/1,984.52
  6. Step 6: Final answer
    x = 1,002.33

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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.