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Finding the Fourth Proportional to 3,079.56, 4,619.40 and 771

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Solution

The fourth proportional to 3,079.56, 4,619.40 and 771 is: 1,156.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,079.56 : 4,619.40 = 771 : x
  2. Step 2: Convert to fraction form
    3,079.56/4,619.40 = 771/x
  3. Step 3: Cross multiply
    3,079.56x = 4,619.40 × 771
  4. Step 4: Simplify right side
    3,079.56x = 3,561,557.40
  5. Step 5: Solve for x
    x = 3,561,557.40/3,079.56
  6. Step 6: Final answer
    x = 1,156.52

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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.