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Finding the Fourth Proportional to 39,448, 54,438.24 and 21,784

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Solution

The fourth proportional to 39,448, 54,438.24 and 21,784 is: 30,061.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,448 : 54,438.24 = 21,784 : x
  2. Step 2: Convert to fraction form
    39,448/54,438.24 = 21,784/x
  3. Step 3: Cross multiply
    39,448x = 54,438.24 × 21,784
  4. Step 4: Simplify right side
    39,448x = 1,185,882,620.16
  5. Step 5: Solve for x
    x = 1,185,882,620.16/39,448
  6. Step 6: Final answer
    x = 30,061.92

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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.