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Finding the Fourth Proportional to 411,386.20, 618,116.10 and 261,698.20

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Solution

The fourth proportional to 411,386.20, 618,116.10 and 261,698.20 is: 393,206.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,386.20 : 618,116.10 = 261,698.20 : x
  2. Step 2: Convert to fraction form
    411,386.20/618,116.10 = 261,698.20/x
  3. Step 3: Cross multiply
    411,386.20x = 618,116.10 × 261,698.20
  4. Step 4: Simplify right side
    411,386.20x = 161,759,870,761.02
  5. Step 5: Solve for x
    x = 161,759,870,761.02/411,386.20
  6. Step 6: Final answer
    x = 393,206.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.