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Finding the Fourth Proportional to 2,172.07, 3,257.79 and 711.28

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Solution

The fourth proportional to 2,172.07, 3,257.79 and 711.28 is: 1,066.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.07 : 3,257.79 = 711.28 : x
  2. Step 2: Convert to fraction form
    2,172.07/3,257.79 = 711.28/x
  3. Step 3: Cross multiply
    2,172.07x = 3,257.79 × 711.28
  4. Step 4: Simplify right side
    2,172.07x = 2,317,200.87
  5. Step 5: Solve for x
    x = 2,317,200.87/2,172.07
  6. Step 6: Final answer
    x = 1,066.82

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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.