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Finding the Fourth Proportional to 412,666.41, 618,920.80 and 128,360.40

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Solution

The fourth proportional to 412,666.41, 618,920.80 and 128,360.40 is: 192,516.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    412,666.41 : 618,920.80 = 128,360.40 : x
  2. Step 2: Convert to fraction form
    412,666.41/618,920.80 = 128,360.40/x
  3. Step 3: Cross multiply
    412,666.41x = 618,920.80 × 128,360.40
  4. Step 4: Simplify right side
    412,666.41x = 79,444,918,814.47
  5. Step 5: Solve for x
    x = 79,444,918,814.47/412,666.41
  6. Step 6: Final answer
    x = 192,516.08

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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.