Home / 2,620.19-3,930.31-771.34

Finding the Fourth Proportional to 2,620.19, 3,930.31 and 771.34

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Solution

The fourth proportional to 2,620.19, 3,930.31 and 771.34 is: 1,157.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.19 : 3,930.31 = 771.34 : x
  2. Step 2: Convert to fraction form
    2,620.19/3,930.31 = 771.34/x
  3. Step 3: Cross multiply
    2,620.19x = 3,930.31 × 771.34
  4. Step 4: Simplify right side
    2,620.19x = 3,031,605.32
  5. Step 5: Solve for x
    x = 3,031,605.32/2,620.19
  6. Step 6: Final answer
    x = 1,157.02

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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.