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Finding the Fourth Proportional to 1,811.97, 2,718.16 and 771.32

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Solution

The fourth proportional to 1,811.97, 2,718.16 and 771.32 is: 1,157.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.97 : 2,718.16 = 771.32 : x
  2. Step 2: Convert to fraction form
    1,811.97/2,718.16 = 771.32/x
  3. Step 3: Cross multiply
    1,811.97x = 2,718.16 × 771.32
  4. Step 4: Simplify right side
    1,811.97x = 2,096,576.04
  5. Step 5: Solve for x
    x = 2,096,576.04/1,811.97
  6. Step 6: Final answer
    x = 1,157.07

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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.