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Finding the Fourth Proportional to 129,638.70, 194,458.05 and 40,919.40

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Solution

The fourth proportional to 129,638.70, 194,458.05 and 40,919.40 is: 61,379.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,638.70 : 194,458.05 = 40,919.40 : x
  2. Step 2: Convert to fraction form
    129,638.70/194,458.05 = 40,919.40/x
  3. Step 3: Cross multiply
    129,638.70x = 194,458.05 × 40,919.40
  4. Step 4: Simplify right side
    129,638.70x = 7,957,106,731.17
  5. Step 5: Solve for x
    x = 7,957,106,731.17/129,638.70
  6. Step 6: Final answer
    x = 61,379.10

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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.