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Finding the Fourth Proportional to 21,137.56, 29,143.30 and 13,570.52

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Solution

The fourth proportional to 21,137.56, 29,143.30 and 13,570.52 is: 18,710.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,137.56 : 29,143.30 = 13,570.52 : x
  2. Step 2: Convert to fraction form
    21,137.56/29,143.30 = 13,570.52/x
  3. Step 3: Cross multiply
    21,137.56x = 29,143.30 × 13,570.52
  4. Step 4: Simplify right side
    21,137.56x = 395,489,735.52
  5. Step 5: Solve for x
    x = 395,489,735.52/21,137.56
  6. Step 6: Final answer
    x = 18,710.28

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.