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Finding the Fourth Proportional to 28,776.90, 39,718.25 and 19,340.00

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Solution

The fourth proportional to 28,776.90, 39,718.25 and 19,340.00 is: 26,693.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,776.90 : 39,718.25 = 19,340.00 : x
  2. Step 2: Convert to fraction form
    28,776.90/39,718.25 = 19,340.00/x
  3. Step 3: Cross multiply
    28,776.90x = 39,718.25 × 19,340.00
  4. Step 4: Simplify right side
    28,776.90x = 768,150,659.71
  5. Step 5: Solve for x
    x = 768,150,659.71/28,776.90
  6. Step 6: Final answer
    x = 26,693.31

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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.