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Finding the Fourth Proportional to 2,071.40, 3,106.94 and 771.88

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Solution

The fourth proportional to 2,071.40, 3,106.94 and 771.88 is: 1,157.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,071.40 : 3,106.94 = 771.88 : x
  2. Step 2: Convert to fraction form
    2,071.40/3,106.94 = 771.88/x
  3. Step 3: Cross multiply
    2,071.40x = 3,106.94 × 771.88
  4. Step 4: Simplify right side
    2,071.40x = 2,398,184.85
  5. Step 5: Solve for x
    x = 2,398,184.85/2,071.40
  6. Step 6: Final answer
    x = 1,157.76

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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.