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Finding the Fourth Proportional to 39,886.54, 55,042.32 and 21,736.87

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Solution

The fourth proportional to 39,886.54, 55,042.32 and 21,736.87 is: 29,996.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,886.54 : 55,042.32 = 21,736.87 : x
  2. Step 2: Convert to fraction form
    39,886.54/55,042.32 = 21,736.87/x
  3. Step 3: Cross multiply
    39,886.54x = 55,042.32 × 21,736.87
  4. Step 4: Simplify right side
    39,886.54x = 1,196,447,479.13
  5. Step 5: Solve for x
    x = 1,196,447,479.13/39,886.54
  6. Step 6: Final answer
    x = 29,996.28

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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.