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Finding the Fourth Proportional to 21,143.61, 29,144.18 and 14,335.43

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Solution

The fourth proportional to 21,143.61, 29,144.18 and 14,335.43 is: 19,759.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,143.61 : 29,144.18 = 14,335.43 : x
  2. Step 2: Convert to fraction form
    21,143.61/29,144.18 = 14,335.43/x
  3. Step 3: Cross multiply
    21,143.61x = 29,144.18 × 14,335.43
  4. Step 4: Simplify right side
    21,143.61x = 417,794,134.90
  5. Step 5: Solve for x
    x = 417,794,134.90/21,143.61
  6. Step 6: Final answer
    x = 19,759.83

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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.