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Finding the Fourth Proportional to 10,920.11, 16,383 and 3,129.53

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Solution

The fourth proportional to 10,920.11, 16,383 and 3,129.53 is: 4,695.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,920.11 : 16,383 = 3,129.53 : x
  2. Step 2: Convert to fraction form
    10,920.11/16,383 = 3,129.53/x
  3. Step 3: Cross multiply
    10,920.11x = 16,383 × 3,129.53
  4. Step 4: Simplify right side
    10,920.11x = 51,271,089.99
  5. Step 5: Solve for x
    x = 51,271,089.99/10,920.11
  6. Step 6: Final answer
    x = 4,695.11

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Why These Related Problems?

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