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Finding the Fourth Proportional to 2,811.54, 3,879.72 and 1,552.40

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Solution

The fourth proportional to 2,811.54, 3,879.72 and 1,552.40 is: 2,142.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.54 : 3,879.72 = 1,552.40 : x
  2. Step 2: Convert to fraction form
    2,811.54/3,879.72 = 1,552.40/x
  3. Step 3: Cross multiply
    2,811.54x = 3,879.72 × 1,552.40
  4. Step 4: Simplify right side
    2,811.54x = 6,022,857.93
  5. Step 5: Solve for x
    x = 6,022,857.93/2,811.54
  6. Step 6: Final answer
    x = 2,142.19

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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.