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Finding the Fourth Proportional to 21,078.84, 29,088 and 11,647.20

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Solution

The fourth proportional to 21,078.84, 29,088 and 11,647.20 is: 16,072.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.84 : 29,088 = 11,647.20 : x
  2. Step 2: Convert to fraction form
    21,078.84/29,088 = 11,647.20/x
  3. Step 3: Cross multiply
    21,078.84x = 29,088 × 11,647.20
  4. Step 4: Simplify right side
    21,078.84x = 338,793,753.60
  5. Step 5: Solve for x
    x = 338,793,753.60/21,078.84
  6. Step 6: Final answer
    x = 16,072.69

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Why These Related Problems?

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