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Finding the Fourth Proportional to 1,978.99, 2,968.49 and 809.01

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Solution

The fourth proportional to 1,978.99, 2,968.49 and 809.01 is: 1,213.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,978.99 : 2,968.49 = 809.01 : x
  2. Step 2: Convert to fraction form
    1,978.99/2,968.49 = 809.01/x
  3. Step 3: Cross multiply
    1,978.99x = 2,968.49 × 809.01
  4. Step 4: Simplify right side
    1,978.99x = 2,401,540.12
  5. Step 5: Solve for x
    x = 2,401,540.12/1,978.99
  6. Step 6: Final answer
    x = 1,213.52

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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.