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Finding the Fourth Proportional to 13,881.92, 19,129.86 and 9,891.92

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Solution

The fourth proportional to 13,881.92, 19,129.86 and 9,891.92 is: 13,631.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,881.92 : 19,129.86 = 9,891.92 : x
  2. Step 2: Convert to fraction form
    13,881.92/19,129.86 = 9,891.92/x
  3. Step 3: Cross multiply
    13,881.92x = 19,129.86 × 9,891.92
  4. Step 4: Simplify right side
    13,881.92x = 189,231,044.73
  5. Step 5: Solve for x
    x = 189,231,044.73/13,881.92
  6. Step 6: Final answer
    x = 13,631.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.