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Finding the Fourth Proportional to 28,765.92, 43,207.92 and 18,919.20

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Solution

The fourth proportional to 28,765.92, 43,207.92 and 18,919.20 is: 28,417.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,765.92 : 43,207.92 = 18,919.20 : x
  2. Step 2: Convert to fraction form
    28,765.92/43,207.92 = 18,919.20/x
  3. Step 3: Cross multiply
    28,765.92x = 43,207.92 × 18,919.20
  4. Step 4: Simplify right side
    28,765.92x = 817,459,280.06
  5. Step 5: Solve for x
    x = 817,459,280.06/28,765.92
  6. Step 6: Final answer
    x = 28,417.63

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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.