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Finding the Fourth Proportional to 2,720.31, 4,080.47 and 668.31

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Solution

The fourth proportional to 2,720.31, 4,080.47 and 668.31 is: 1,002.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.31 : 4,080.47 = 668.31 : x
  2. Step 2: Convert to fraction form
    2,720.31/4,080.47 = 668.31/x
  3. Step 3: Cross multiply
    2,720.31x = 4,080.47 × 668.31
  4. Step 4: Simplify right side
    2,720.31x = 2,727,018.91
  5. Step 5: Solve for x
    x = 2,727,018.91/2,720.31
  6. Step 6: Final answer
    x = 1,002.47

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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.