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Finding the Fourth Proportional to 2,720.79, 4,081.80 and 872.07

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Solution

The fourth proportional to 2,720.79, 4,081.80 and 872.07 is: 1,308.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.79 : 4,081.80 = 872.07 : x
  2. Step 2: Convert to fraction form
    2,720.79/4,081.80 = 872.07/x
  3. Step 3: Cross multiply
    2,720.79x = 4,081.80 × 872.07
  4. Step 4: Simplify right side
    2,720.79x = 3,559,615.33
  5. Step 5: Solve for x
    x = 3,559,615.33/2,720.79
  6. Step 6: Final answer
    x = 1,308.30

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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.