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Finding the Fourth Proportional to 2,768.65, 4,152.13 and 919.28

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Solution

The fourth proportional to 2,768.65, 4,152.13 and 919.28 is: 1,378.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,768.65 : 4,152.13 = 919.28 : x
  2. Step 2: Convert to fraction form
    2,768.65/4,152.13 = 919.28/x
  3. Step 3: Cross multiply
    2,768.65x = 4,152.13 × 919.28
  4. Step 4: Simplify right side
    2,768.65x = 3,816,978.15
  5. Step 5: Solve for x
    x = 3,816,978.15/2,768.65
  6. Step 6: Final answer
    x = 1,378.64

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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.