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Finding the Fourth Proportional to 1,911.17, 2,866.85 and 612.65

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Solution

The fourth proportional to 1,911.17, 2,866.85 and 612.65 is: 919.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.17 : 2,866.85 = 612.65 : x
  2. Step 2: Convert to fraction form
    1,911.17/2,866.85 = 612.65/x
  3. Step 3: Cross multiply
    1,911.17x = 2,866.85 × 612.65
  4. Step 4: Simplify right side
    1,911.17x = 1,756,358.26
  5. Step 5: Solve for x
    x = 1,756,358.26/1,911.17
  6. Step 6: Final answer
    x = 919.00

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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.