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Finding the Fourth Proportional to 1,911.06, 2,865.78 and 678.65

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Solution

The fourth proportional to 1,911.06, 2,865.78 and 678.65 is: 1,017.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.06 : 2,865.78 = 678.65 : x
  2. Step 2: Convert to fraction form
    1,911.06/2,865.78 = 678.65/x
  3. Step 3: Cross multiply
    1,911.06x = 2,865.78 × 678.65
  4. Step 4: Simplify right side
    1,911.06x = 1,944,847.27
  5. Step 5: Solve for x
    x = 1,944,847.27/1,911.06
  6. Step 6: Final answer
    x = 1,017.68

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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.