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Finding the Fourth Proportional to 1,988.11, 2,978.85 and 1,205.74

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Solution

The fourth proportional to 1,988.11, 2,978.85 and 1,205.74 is: 1,806.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.11 : 2,978.85 = 1,205.74 : x
  2. Step 2: Convert to fraction form
    1,988.11/2,978.85 = 1,205.74/x
  3. Step 3: Cross multiply
    1,988.11x = 2,978.85 × 1,205.74
  4. Step 4: Simplify right side
    1,988.11x = 3,591,718.60
  5. Step 5: Solve for x
    x = 3,591,718.60/1,988.11
  6. Step 6: Final answer
    x = 1,806.60

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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.