Home / 21,072.15-31,369.68-20,961.99

Finding the Fourth Proportional to 21,072.15, 31,369.68 and 20,961.99

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Solution

The fourth proportional to 21,072.15, 31,369.68 and 20,961.99 is: 31,205.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,072.15 : 31,369.68 = 20,961.99 : x
  2. Step 2: Convert to fraction form
    21,072.15/31,369.68 = 20,961.99/x
  3. Step 3: Cross multiply
    21,072.15x = 31,369.68 × 20,961.99
  4. Step 4: Simplify right side
    21,072.15x = 657,570,918.46
  5. Step 5: Solve for x
    x = 657,570,918.46/21,072.15
  6. Step 6: Final answer
    x = 31,205.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.