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Finding the Fourth Proportional to 38,886, 53,662.68 and 21,222

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Solution

The fourth proportional to 38,886, 53,662.68 and 21,222 is: 29,286.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,886 : 53,662.68 = 21,222 : x
  2. Step 2: Convert to fraction form
    38,886/53,662.68 = 21,222/x
  3. Step 3: Cross multiply
    38,886x = 53,662.68 × 21,222
  4. Step 4: Simplify right side
    38,886x = 1,138,829,394.96
  5. Step 5: Solve for x
    x = 1,138,829,394.96/38,886
  6. Step 6: Final answer
    x = 29,286.36

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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.