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Finding the Fourth Proportional to 2,620.71, 3,930.44 and 771.32

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Solution

The fourth proportional to 2,620.71, 3,930.44 and 771.32 is: 1,156.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.71 : 3,930.44 = 771.32 : x
  2. Step 2: Convert to fraction form
    2,620.71/3,930.44 = 771.32/x
  3. Step 3: Cross multiply
    2,620.71x = 3,930.44 × 771.32
  4. Step 4: Simplify right side
    2,620.71x = 3,031,632.95
  5. Step 5: Solve for x
    x = 3,031,632.95/2,620.71
  6. Step 6: Final answer
    x = 1,156.80

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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.