Home / 21,140.92-31,705.05-13,255.42

Finding the Fourth Proportional to 21,140.92, 31,705.05 and 13,255.42

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Solution

The fourth proportional to 21,140.92, 31,705.05 and 13,255.42 is: 19,879.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,140.92 : 31,705.05 = 13,255.42 : x
  2. Step 2: Convert to fraction form
    21,140.92/31,705.05 = 13,255.42/x
  3. Step 3: Cross multiply
    21,140.92x = 31,705.05 × 13,255.42
  4. Step 4: Simplify right side
    21,140.92x = 420,263,753.87
  5. Step 5: Solve for x
    x = 420,263,753.87/21,140.92
  6. Step 6: Final answer
    x = 19,879.16

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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.