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Finding the Fourth Proportional to 685,689.37, 946,254.05 and 399,406.21

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Solution

The fourth proportional to 685,689.37, 946,254.05 and 399,406.21 is: 551,182.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,689.37 : 946,254.05 = 399,406.21 : x
  2. Step 2: Convert to fraction form
    685,689.37/946,254.05 = 399,406.21/x
  3. Step 3: Cross multiply
    685,689.37x = 946,254.05 × 399,406.21
  4. Step 4: Simplify right side
    685,689.37x = 377,939,740,942.76
  5. Step 5: Solve for x
    x = 377,939,740,942.76/685,689.37
  6. Step 6: Final answer
    x = 551,182.15

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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.