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Finding the Fourth Proportional to 1,993.12, 2,989.84 and 694.60

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Solution

The fourth proportional to 1,993.12, 2,989.84 and 694.60 is: 1,041.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.12 : 2,989.84 = 694.60 : x
  2. Step 2: Convert to fraction form
    1,993.12/2,989.84 = 694.60/x
  3. Step 3: Cross multiply
    1,993.12x = 2,989.84 × 694.60
  4. Step 4: Simplify right side
    1,993.12x = 2,076,742.86
  5. Step 5: Solve for x
    x = 2,076,742.86/1,993.12
  6. Step 6: Final answer
    x = 1,041.96

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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.