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Finding the Fourth Proportional to 1,768.44, 2,439.72 and 1,138.86

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Solution

The fourth proportional to 1,768.44, 2,439.72 and 1,138.86 is: 1,571.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,768.44 : 2,439.72 = 1,138.86 : x
  2. Step 2: Convert to fraction form
    1,768.44/2,439.72 = 1,138.86/x
  3. Step 3: Cross multiply
    1,768.44x = 2,439.72 × 1,138.86
  4. Step 4: Simplify right side
    1,768.44x = 2,778,499.52
  5. Step 5: Solve for x
    x = 2,778,499.52/1,768.44
  6. Step 6: Final answer
    x = 1,571.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.