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Finding the Fourth Proportional to 621,140.30, 857,153.76 and 349,219.70

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Solution

The fourth proportional to 621,140.30, 857,153.76 and 349,219.70 is: 481,912.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,140.30 : 857,153.76 = 349,219.70 : x
  2. Step 2: Convert to fraction form
    621,140.30/857,153.76 = 349,219.70/x
  3. Step 3: Cross multiply
    621,140.30x = 857,153.76 × 349,219.70
  4. Step 4: Simplify right side
    621,140.30x = 299,334,978,921.07
  5. Step 5: Solve for x
    x = 299,334,978,921.07/621,140.30
  6. Step 6: Final answer
    x = 481,912.02

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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.