Home / 21,090.24-31,619.76-12,768.44

Finding the Fourth Proportional to 21,090.24, 31,619.76 and 12,768.44

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Solution

The fourth proportional to 21,090.24, 31,619.76 and 12,768.44 is: 19,143.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,090.24 : 31,619.76 = 12,768.44 : x
  2. Step 2: Convert to fraction form
    21,090.24/31,619.76 = 12,768.44/x
  3. Step 3: Cross multiply
    21,090.24x = 31,619.76 × 12,768.44
  4. Step 4: Simplify right side
    21,090.24x = 403,735,008.37
  5. Step 5: Solve for x
    x = 403,735,008.37/21,090.24
  6. Step 6: Final answer
    x = 19,143.22

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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.