Home / 21,722.87-29,970.59-12,161.36

Finding the Fourth Proportional to 21,722.87, 29,970.59 and 12,161.36

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Solution

The fourth proportional to 21,722.87, 29,970.59 and 12,161.36 is: 16,778.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,722.87 : 29,970.59 = 12,161.36 : x
  2. Step 2: Convert to fraction form
    21,722.87/29,970.59 = 12,161.36/x
  3. Step 3: Cross multiply
    21,722.87x = 29,970.59 × 12,161.36
  4. Step 4: Simplify right side
    21,722.87x = 364,483,014.95
  5. Step 5: Solve for x
    x = 364,483,014.95/21,722.87
  6. Step 6: Final answer
    x = 16,778.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.