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Finding the Fourth Proportional to 19,629.30, 29,431.80 and 11,305.20

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Solution

The fourth proportional to 19,629.30, 29,431.80 and 11,305.20 is: 16,950.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,629.30 : 29,431.80 = 11,305.20 : x
  2. Step 2: Convert to fraction form
    19,629.30/29,431.80 = 11,305.20/x
  3. Step 3: Cross multiply
    19,629.30x = 29,431.80 × 11,305.20
  4. Step 4: Simplify right side
    19,629.30x = 332,732,385.36
  5. Step 5: Solve for x
    x = 332,732,385.36/19,629.30
  6. Step 6: Final answer
    x = 16,950.80

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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.