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Finding the Fourth Proportional to 65,859.12, 98,788.80 and 19,112.40

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Solution

The fourth proportional to 65,859.12, 98,788.80 and 19,112.40 is: 28,668.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,859.12 : 98,788.80 = 19,112.40 : x
  2. Step 2: Convert to fraction form
    65,859.12/98,788.80 = 19,112.40/x
  3. Step 3: Cross multiply
    65,859.12x = 98,788.80 × 19,112.40
  4. Step 4: Simplify right side
    65,859.12x = 1,888,091,061.12
  5. Step 5: Solve for x
    x = 1,888,091,061.12/65,859.12
  6. Step 6: Final answer
    x = 28,668.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.