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Finding the Fourth Proportional to 1,989.06, 2,978.04 and 1,293.99

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Solution

The fourth proportional to 1,989.06, 2,978.04 and 1,293.99 is: 1,937.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.06 : 2,978.04 = 1,293.99 : x
  2. Step 2: Convert to fraction form
    1,989.06/2,978.04 = 1,293.99/x
  3. Step 3: Cross multiply
    1,989.06x = 2,978.04 × 1,293.99
  4. Step 4: Simplify right side
    1,989.06x = 3,853,553.98
  5. Step 5: Solve for x
    x = 3,853,553.98/1,989.06
  6. Step 6: Final answer
    x = 1,937.37

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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.