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Finding the Fourth Proportional to 13,957.92, 20,939.04 and 8,688.87

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Solution

The fourth proportional to 13,957.92, 20,939.04 and 8,688.87 is: 13,034.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,957.92 : 20,939.04 = 8,688.87 : x
  2. Step 2: Convert to fraction form
    13,957.92/20,939.04 = 8,688.87/x
  3. Step 3: Cross multiply
    13,957.92x = 20,939.04 × 8,688.87
  4. Step 4: Simplify right side
    13,957.92x = 181,936,596.48
  5. Step 5: Solve for x
    x = 181,936,596.48/13,957.92
  6. Step 6: Final answer
    x = 13,034.65

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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.