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Finding the Fourth Proportional to 621,253.36, 857,400.21 and 345,638.47

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Solution

The fourth proportional to 621,253.36, 857,400.21 and 345,638.47 is: 477,020.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,253.36 : 857,400.21 = 345,638.47 : x
  2. Step 2: Convert to fraction form
    621,253.36/857,400.21 = 345,638.47/x
  3. Step 3: Cross multiply
    621,253.36x = 857,400.21 × 345,638.47
  4. Step 4: Simplify right side
    621,253.36x = 296,350,496,762.08
  5. Step 5: Solve for x
    x = 296,350,496,762.08/621,253.36
  6. Step 6: Final answer
    x = 477,020.35

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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.