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Finding the Fourth Proportional to 38,990.25, 53,805 and 21,991.79

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Solution

The fourth proportional to 38,990.25, 53,805 and 21,991.79 is: 30,347.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,990.25 : 53,805 = 21,991.79 : x
  2. Step 2: Convert to fraction form
    38,990.25/53,805 = 21,991.79/x
  3. Step 3: Cross multiply
    38,990.25x = 53,805 × 21,991.79
  4. Step 4: Simplify right side
    38,990.25x = 1,183,267,991.93
  5. Step 5: Solve for x
    x = 1,183,267,991.93/38,990.25
  6. Step 6: Final answer
    x = 30,347.79

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1.5x scale

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.