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Finding the Fourth Proportional to 19,863.60, 29,811.60 and 19,215.60

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Solution

The fourth proportional to 19,863.60, 29,811.60 and 19,215.60 is: 28,839.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,863.60 : 29,811.60 = 19,215.60 : x
  2. Step 2: Convert to fraction form
    19,863.60/29,811.60 = 19,215.60/x
  3. Step 3: Cross multiply
    19,863.60x = 29,811.60 × 19,215.60
  4. Step 4: Simplify right side
    19,863.60x = 572,847,780.96
  5. Step 5: Solve for x
    x = 572,847,780.96/19,863.60
  6. Step 6: Final answer
    x = 28,839.07

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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.