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Finding the Fourth Proportional to 38,930.79, 53,727.78 and 21,934.16

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Solution

The fourth proportional to 38,930.79, 53,727.78 and 21,934.16 is: 30,270.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,930.79 : 53,727.78 = 21,934.16 : x
  2. Step 2: Convert to fraction form
    38,930.79/53,727.78 = 21,934.16/x
  3. Step 3: Cross multiply
    38,930.79x = 53,727.78 × 21,934.16
  4. Step 4: Simplify right side
    38,930.79x = 1,178,473,454.33
  5. Step 5: Solve for x
    x = 1,178,473,454.33/38,930.79
  6. Step 6: Final answer
    x = 30,270.99

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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.