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Finding the Fourth Proportional to 18,731.91, 28,111.73 and 8,871.21

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Solution

The fourth proportional to 18,731.91, 28,111.73 and 8,871.21 is: 13,313.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,731.91 : 28,111.73 = 8,871.21 : x
  2. Step 2: Convert to fraction form
    18,731.91/28,111.73 = 8,871.21/x
  3. Step 3: Cross multiply
    18,731.91x = 28,111.73 × 8,871.21
  4. Step 4: Simplify right side
    18,731.91x = 249,385,015.94
  5. Step 5: Solve for x
    x = 249,385,015.94/18,731.91
  6. Step 6: Final answer
    x = 13,313.38

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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.