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Finding the Fourth Proportional to 1,385.62, 2,079.86 and 1,080.81

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Solution

The fourth proportional to 1,385.62, 2,079.86 and 1,080.81 is: 1,622.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.62 : 2,079.86 = 1,080.81 : x
  2. Step 2: Convert to fraction form
    1,385.62/2,079.86 = 1,080.81/x
  3. Step 3: Cross multiply
    1,385.62x = 2,079.86 × 1,080.81
  4. Step 4: Simplify right side
    1,385.62x = 2,247,934.16
  5. Step 5: Solve for x
    x = 2,247,934.16/1,385.62
  6. Step 6: Final answer
    x = 1,622.33

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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.