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Finding the Fourth Proportional to 678,624.15, 936,291.33 and 392,039.67

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Solution

The fourth proportional to 678,624.15, 936,291.33 and 392,039.67 is: 540,893.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,624.15 : 936,291.33 = 392,039.67 : x
  2. Step 2: Convert to fraction form
    678,624.15/936,291.33 = 392,039.67/x
  3. Step 3: Cross multiply
    678,624.15x = 936,291.33 × 392,039.67
  4. Step 4: Simplify right side
    678,624.15x = 367,063,344,037.06
  5. Step 5: Solve for x
    x = 367,063,344,037.06/678,624.15
  6. Step 6: Final answer
    x = 540,893.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.