Home / 1,380.03-2,066.19-720.47

Finding the Fourth Proportional to 1,380.03, 2,066.19 and 720.47

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Solution

The fourth proportional to 1,380.03, 2,066.19 and 720.47 is: 1,078.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.03 : 2,066.19 = 720.47 : x
  2. Step 2: Convert to fraction form
    1,380.03/2,066.19 = 720.47/x
  3. Step 3: Cross multiply
    1,380.03x = 2,066.19 × 720.47
  4. Step 4: Simplify right side
    1,380.03x = 1,488,627.91
  5. Step 5: Solve for x
    x = 1,488,627.91/1,380.03
  6. Step 6: Final answer
    x = 1,078.69

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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.