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Finding the Fourth Proportional to 38,783.51, 53,515.41 and 21,784.50

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Solution

The fourth proportional to 38,783.51, 53,515.41 and 21,784.50 is: 30,059.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,783.51 : 53,515.41 = 21,784.50 : x
  2. Step 2: Convert to fraction form
    38,783.51/53,515.41 = 21,784.50/x
  3. Step 3: Cross multiply
    38,783.51x = 53,515.41 × 21,784.50
  4. Step 4: Simplify right side
    38,783.51x = 1,165,806,449.15
  5. Step 5: Solve for x
    x = 1,165,806,449.15/38,783.51
  6. Step 6: Final answer
    x = 30,059.33

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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.