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Finding the Fourth Proportional to 191,878.70, 287,558.85 and 128,518.70

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Solution

The fourth proportional to 191,878.70, 287,558.85 and 128,518.70 is: 192,604.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,878.70 : 287,558.85 = 128,518.70 : x
  2. Step 2: Convert to fraction form
    191,878.70/287,558.85 = 128,518.70/x
  3. Step 3: Cross multiply
    191,878.70x = 287,558.85 × 128,518.70
  4. Step 4: Simplify right side
    191,878.70x = 36,956,689,575.50
  5. Step 5: Solve for x
    x = 36,956,689,575.50/191,878.70
  6. Step 6: Final answer
    x = 192,604.44

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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.