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Finding the Fourth Proportional to 18,939.71, 26,135.68 and 10,871.50

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Solution

The fourth proportional to 18,939.71, 26,135.68 and 10,871.50 is: 15,002.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.71 : 26,135.68 = 10,871.50 : x
  2. Step 2: Convert to fraction form
    18,939.71/26,135.68 = 10,871.50/x
  3. Step 3: Cross multiply
    18,939.71x = 26,135.68 × 10,871.50
  4. Step 4: Simplify right side
    18,939.71x = 284,134,045.12
  5. Step 5: Solve for x
    x = 284,134,045.12/18,939.71
  6. Step 6: Final answer
    x = 15,002.03

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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.