Home / 21,283.83-31,940.33-20,379.87

Finding the Fourth Proportional to 21,283.83, 31,940.33 and 20,379.87

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Solution

The fourth proportional to 21,283.83, 31,940.33 and 20,379.87 is: 30,583.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,283.83 : 31,940.33 = 20,379.87 : x
  2. Step 2: Convert to fraction form
    21,283.83/31,940.33 = 20,379.87/x
  3. Step 3: Cross multiply
    21,283.83x = 31,940.33 × 20,379.87
  4. Step 4: Simplify right side
    21,283.83x = 650,939,671.26
  5. Step 5: Solve for x
    x = 650,939,671.26/21,283.83
  6. Step 6: Final answer
    x = 30,583.77

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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.