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Finding the Fourth Proportional to 1,379.17, 2,067.81 and 720.64

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Solution

The fourth proportional to 1,379.17, 2,067.81 and 720.64 is: 1,080.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.17 : 2,067.81 = 720.64 : x
  2. Step 2: Convert to fraction form
    1,379.17/2,067.81 = 720.64/x
  3. Step 3: Cross multiply
    1,379.17x = 2,067.81 × 720.64
  4. Step 4: Simplify right side
    1,379.17x = 1,490,146.60
  5. Step 5: Solve for x
    x = 1,490,146.60/1,379.17
  6. Step 6: Final answer
    x = 1,080.47

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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.