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Finding the Fourth Proportional to 2,693.21, 4,039.97 and 718.79

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Solution

The fourth proportional to 2,693.21, 4,039.97 and 718.79 is: 1,078.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,693.21 : 4,039.97 = 718.79 : x
  2. Step 2: Convert to fraction form
    2,693.21/4,039.97 = 718.79/x
  3. Step 3: Cross multiply
    2,693.21x = 4,039.97 × 718.79
  4. Step 4: Simplify right side
    2,693.21x = 2,903,866.24
  5. Step 5: Solve for x
    x = 2,903,866.24/2,693.21
  6. Step 6: Final answer
    x = 1,078.22

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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.