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Finding the Fourth Proportional to 21,321.50, 29,423.61 and 11,890.07

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Solution

The fourth proportional to 21,321.50, 29,423.61 and 11,890.07 is: 16,408.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,321.50 : 29,423.61 = 11,890.07 : x
  2. Step 2: Convert to fraction form
    21,321.50/29,423.61 = 11,890.07/x
  3. Step 3: Cross multiply
    21,321.50x = 29,423.61 × 11,890.07
  4. Step 4: Simplify right side
    21,321.50x = 349,848,635.43
  5. Step 5: Solve for x
    x = 349,848,635.43/21,321.50
  6. Step 6: Final answer
    x = 16,408.25

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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.