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Finding the Fourth Proportional to 438,786, 605,510.10 and 245,205.72

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Solution

The fourth proportional to 438,786, 605,510.10 and 245,205.72 is: 338,375.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,786 : 605,510.10 = 245,205.72 : x
  2. Step 2: Convert to fraction form
    438,786/605,510.10 = 245,205.72/x
  3. Step 3: Cross multiply
    438,786x = 605,510.10 × 245,205.72
  4. Step 4: Simplify right side
    438,786x = 148,474,540,037.77
  5. Step 5: Solve for x
    x = 148,474,540,037.77/438,786
  6. Step 6: Final answer
    x = 338,375.75

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Double scale
Find fourth proportional to 438,787, 605,511.48 and 245,206.72
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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.