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Finding the Fourth Proportional to 10,920.80, 16,383.62 and 3,129

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Solution

The fourth proportional to 10,920.80, 16,383.62 and 3,129 is: 4,694.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,920.80 : 16,383.62 = 3,129 : x
  2. Step 2: Convert to fraction form
    10,920.80/16,383.62 = 3,129/x
  3. Step 3: Cross multiply
    10,920.80x = 16,383.62 × 3,129
  4. Step 4: Simplify right side
    10,920.80x = 51,264,354.80
  5. Step 5: Solve for x
    x = 51,264,354.80/10,920.80
  6. Step 6: Final answer
    x = 4,694.20

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.