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Finding the Fourth Proportional to 85,587.44, 128,411.51 and 38,198.21

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Solution

The fourth proportional to 85,587.44, 128,411.51 and 38,198.21 is: 57,310.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,587.44 : 128,411.51 = 38,198.21 : x
  2. Step 2: Convert to fraction form
    85,587.44/128,411.51 = 38,198.21/x
  3. Step 3: Cross multiply
    85,587.44x = 128,411.51 × 38,198.21
  4. Step 4: Simplify right side
    85,587.44x = 4,905,088,992.35
  5. Step 5: Solve for x
    x = 4,905,088,992.35/85,587.44
  6. Step 6: Final answer
    x = 57,310.85

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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.