Home / 21,137.79-31,679.13-11,777.43

Finding the Fourth Proportional to 21,137.79, 31,679.13 and 11,777.43

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Solution

The fourth proportional to 21,137.79, 31,679.13 and 11,777.43 is: 17,650.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.79 : 31,679.13 = 11,777.43 : x
  2. Step 2: Convert to fraction form
    21,137.79/31,679.13 = 11,777.43/x
  3. Step 3: Cross multiply
    21,137.79x = 31,679.13 × 11,777.43
  4. Step 4: Simplify right side
    21,137.79x = 373,098,706.59
  5. Step 5: Solve for x
    x = 373,098,706.59/21,137.79
  6. Step 6: Final answer
    x = 17,650.79

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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.