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Finding the Fourth Proportional to 1,990.65, 2,979.90 and 1,881.30

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Solution

The fourth proportional to 1,990.65, 2,979.90 and 1,881.30 is: 2,816.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.65 : 2,979.90 = 1,881.30 : x
  2. Step 2: Convert to fraction form
    1,990.65/2,979.90 = 1,881.30/x
  3. Step 3: Cross multiply
    1,990.65x = 2,979.90 × 1,881.30
  4. Step 4: Simplify right side
    1,990.65x = 5,606,085.87
  5. Step 5: Solve for x
    x = 5,606,085.87/1,990.65
  6. Step 6: Final answer
    x = 2,816.21

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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.