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Finding the Fourth Proportional to 28,164.66, 38,845.50 and 19,663.98

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Solution

The fourth proportional to 28,164.66, 38,845.50 and 19,663.98 is: 27,121.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,164.66 : 38,845.50 = 19,663.98 : x
  2. Step 2: Convert to fraction form
    28,164.66/38,845.50 = 19,663.98/x
  3. Step 3: Cross multiply
    28,164.66x = 38,845.50 × 19,663.98
  4. Step 4: Simplify right side
    28,164.66x = 763,857,135.09
  5. Step 5: Solve for x
    x = 763,857,135.09/28,164.66
  6. Step 6: Final answer
    x = 27,121.12

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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.