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Finding the Fourth Proportional to 621,437.37, 857,701.35 and 388,972.13

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Solution

The fourth proportional to 621,437.37, 857,701.35 and 388,972.13 is: 536,855.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,437.37 : 857,701.35 = 388,972.13 : x
  2. Step 2: Convert to fraction form
    621,437.37/857,701.35 = 388,972.13/x
  3. Step 3: Cross multiply
    621,437.37x = 857,701.35 × 388,972.13
  4. Step 4: Simplify right side
    621,437.37x = 333,621,921,013.38
  5. Step 5: Solve for x
    x = 333,621,921,013.38/621,437.37
  6. Step 6: Final answer
    x = 536,855.26

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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.