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Finding the Fourth Proportional to 21,078.78, 29,091.60 and 12,126.12

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Solution

The fourth proportional to 21,078.78, 29,091.60 and 12,126.12 is: 16,735.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.78 : 29,091.60 = 12,126.12 : x
  2. Step 2: Convert to fraction form
    21,078.78/29,091.60 = 12,126.12/x
  3. Step 3: Cross multiply
    21,078.78x = 29,091.60 × 12,126.12
  4. Step 4: Simplify right side
    21,078.78x = 352,768,232.59
  5. Step 5: Solve for x
    x = 352,768,232.59/21,078.78
  6. Step 6: Final answer
    x = 16,735.70

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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.