Home / 21,161.47-31,743.80-7,121.54

Finding the Fourth Proportional to 21,161.47, 31,743.80 and 7,121.54

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Solution

The fourth proportional to 21,161.47, 31,743.80 and 7,121.54 is: 10,682.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,161.47 : 31,743.80 = 7,121.54 : x
  2. Step 2: Convert to fraction form
    21,161.47/31,743.80 = 7,121.54/x
  3. Step 3: Cross multiply
    21,161.47x = 31,743.80 × 7,121.54
  4. Step 4: Simplify right side
    21,161.47x = 226,064,741.45
  5. Step 5: Solve for x
    x = 226,064,741.45/21,161.47
  6. Step 6: Final answer
    x = 10,682.85

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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.