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Finding the Fourth Proportional to 38,646, 53,331.48 and 21,879

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Solution

The fourth proportional to 38,646, 53,331.48 and 21,879 is: 30,193.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,646 : 53,331.48 = 21,879 : x
  2. Step 2: Convert to fraction form
    38,646/53,331.48 = 21,879/x
  3. Step 3: Cross multiply
    38,646x = 53,331.48 × 21,879
  4. Step 4: Simplify right side
    38,646x = 1,166,839,450.92
  5. Step 5: Solve for x
    x = 1,166,839,450.92/38,646
  6. Step 6: Final answer
    x = 30,193.02

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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.