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Finding the Fourth Proportional to 1,986.36, 2,978.95 and 669.96

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Solution

The fourth proportional to 1,986.36, 2,978.95 and 669.96 is: 1,004.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.36 : 2,978.95 = 669.96 : x
  2. Step 2: Convert to fraction form
    1,986.36/2,978.95 = 669.96/x
  3. Step 3: Cross multiply
    1,986.36x = 2,978.95 × 669.96
  4. Step 4: Simplify right side
    1,986.36x = 1,995,777.34
  5. Step 5: Solve for x
    x = 1,995,777.34/1,986.36
  6. Step 6: Final answer
    x = 1,004.74

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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.