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Finding the Fourth Proportional to 621,437.50, 857,701.53 and 388,972.26

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Solution

The fourth proportional to 621,437.50, 857,701.53 and 388,972.26 is: 536,855.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,437.50 : 857,701.53 = 388,972.26 : x
  2. Step 2: Convert to fraction form
    621,437.50/857,701.53 = 388,972.26/x
  3. Step 3: Cross multiply
    621,437.50x = 857,701.53 × 388,972.26
  4. Step 4: Simplify right side
    621,437.50x = 333,622,102,529.56
  5. Step 5: Solve for x
    x = 333,622,102,529.56/621,437.50
  6. Step 6: Final answer
    x = 536,855.44

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Double scale
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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.