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Finding the Fourth Proportional to 38,912.65, 53,698.88 and 21,916.92

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Solution

The fourth proportional to 38,912.65, 53,698.88 and 21,916.92 is: 30,245.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,912.65 : 53,698.88 = 21,916.92 : x
  2. Step 2: Convert to fraction form
    38,912.65/53,698.88 = 21,916.92/x
  3. Step 3: Cross multiply
    38,912.65x = 53,698.88 × 21,916.92
  4. Step 4: Simplify right side
    38,912.65x = 1,176,914,313.21
  5. Step 5: Solve for x
    x = 1,176,914,313.21/38,912.65
  6. Step 6: Final answer
    x = 30,245.03

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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.