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Finding the Fourth Proportional to 38,908.87, 53,688.31 and 21,912.22

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Solution

The fourth proportional to 38,908.87, 53,688.31 and 21,912.22 is: 30,235.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,908.87 : 53,688.31 = 21,912.22 : x
  2. Step 2: Convert to fraction form
    38,908.87/53,688.31 = 21,912.22/x
  3. Step 3: Cross multiply
    38,908.87x = 53,688.31 × 21,912.22
  4. Step 4: Simplify right side
    38,908.87x = 1,176,430,060.15
  5. Step 5: Solve for x
    x = 1,176,430,060.15/38,908.87
  6. Step 6: Final answer
    x = 30,235.52

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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.