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Finding the Fourth Proportional to 2,172.90, 3,259.49 and 874.37

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Solution

The fourth proportional to 2,172.90, 3,259.49 and 874.37 is: 1,311.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.90 : 3,259.49 = 874.37 : x
  2. Step 2: Convert to fraction form
    2,172.90/3,259.49 = 874.37/x
  3. Step 3: Cross multiply
    2,172.90x = 3,259.49 × 874.37
  4. Step 4: Simplify right side
    2,172.90x = 2,850,000.27
  5. Step 5: Solve for x
    x = 2,850,000.27/2,172.90
  6. Step 6: Final answer
    x = 1,311.61

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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.