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Finding the Fourth Proportional to 1,990.32, 2,984.43 and 673.62

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Solution

The fourth proportional to 1,990.32, 2,984.43 and 673.62 is: 1,010.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.32 : 2,984.43 = 673.62 : x
  2. Step 2: Convert to fraction form
    1,990.32/2,984.43 = 673.62/x
  3. Step 3: Cross multiply
    1,990.32x = 2,984.43 × 673.62
  4. Step 4: Simplify right side
    1,990.32x = 2,010,371.74
  5. Step 5: Solve for x
    x = 2,010,371.74/1,990.32
  6. Step 6: Final answer
    x = 1,010.07

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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.