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Finding the Fourth Proportional to 19,899.20, 29,863.20 and 11,124.80

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Solution

The fourth proportional to 19,899.20, 29,863.20 and 11,124.80 is: 16,695.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,899.20 : 29,863.20 = 11,124.80 : x
  2. Step 2: Convert to fraction form
    19,899.20/29,863.20 = 11,124.80/x
  3. Step 3: Cross multiply
    19,899.20x = 29,863.20 × 11,124.80
  4. Step 4: Simplify right side
    19,899.20x = 332,222,127.36
  5. Step 5: Solve for x
    x = 332,222,127.36/19,899.20
  6. Step 6: Final answer
    x = 16,695.25

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1.5x scale

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.