Home / 21,083.74-31,621.95-7,936.21

Finding the Fourth Proportional to 21,083.74, 31,621.95 and 7,936.21

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Solution

The fourth proportional to 21,083.74, 31,621.95 and 7,936.21 is: 11,902.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,083.74 : 31,621.95 = 7,936.21 : x
  2. Step 2: Convert to fraction form
    21,083.74/31,621.95 = 7,936.21/x
  3. Step 3: Cross multiply
    21,083.74x = 31,621.95 × 7,936.21
  4. Step 4: Simplify right side
    21,083.74x = 250,958,435.81
  5. Step 5: Solve for x
    x = 250,958,435.81/21,083.74
  6. Step 6: Final answer
    x = 11,902.94

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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.