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Finding the Fourth Proportional to 18,726.90, 28,081.89 and 9,959.94

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Solution

The fourth proportional to 18,726.90, 28,081.89 and 9,959.94 is: 14,935.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,726.90 : 28,081.89 = 9,959.94 : x
  2. Step 2: Convert to fraction form
    18,726.90/28,081.89 = 9,959.94/x
  3. Step 3: Cross multiply
    18,726.90x = 28,081.89 × 9,959.94
  4. Step 4: Simplify right side
    18,726.90x = 279,693,939.49
  5. Step 5: Solve for x
    x = 279,693,939.49/18,726.90
  6. Step 6: Final answer
    x = 14,935.41

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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.