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Finding the Fourth Proportional to 621,721.86, 858,081.05 and 360,039.11

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Solution

The fourth proportional to 621,721.86, 858,081.05 and 360,039.11 is: 496,914.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,721.86 : 858,081.05 = 360,039.11 : x
  2. Step 2: Convert to fraction form
    621,721.86/858,081.05 = 360,039.11/x
  3. Step 3: Cross multiply
    621,721.86x = 858,081.05 × 360,039.11
  4. Step 4: Simplify right side
    621,721.86x = 308,942,731,459.27
  5. Step 5: Solve for x
    x = 308,942,731,459.27/621,721.86
  6. Step 6: Final answer
    x = 496,914.70

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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.