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Finding the Fourth Proportional to 2,768.38, 4,151.96 and 919.45

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Solution

The fourth proportional to 2,768.38, 4,151.96 and 919.45 is: 1,378.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,768.38 : 4,151.96 = 919.45 : x
  2. Step 2: Convert to fraction form
    2,768.38/4,151.96 = 919.45/x
  3. Step 3: Cross multiply
    2,768.38x = 4,151.96 × 919.45
  4. Step 4: Simplify right side
    2,768.38x = 3,817,523.66
  5. Step 5: Solve for x
    x = 3,817,523.66/2,768.38
  6. Step 6: Final answer
    x = 1,378.98

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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.