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Finding the Fourth Proportional to 1,986.22, 2,979.94 and 947.55

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Solution

The fourth proportional to 1,986.22, 2,979.94 and 947.55 is: 1,421.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.22 : 2,979.94 = 947.55 : x
  2. Step 2: Convert to fraction form
    1,986.22/2,979.94 = 947.55/x
  3. Step 3: Cross multiply
    1,986.22x = 2,979.94 × 947.55
  4. Step 4: Simplify right side
    1,986.22x = 2,823,635.97
  5. Step 5: Solve for x
    x = 2,823,635.97/1,986.22
  6. Step 6: Final answer
    x = 1,421.61

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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.