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Finding the Fourth Proportional to 2,620.68, 3,931.02 and 771.86

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Solution

The fourth proportional to 2,620.68, 3,931.02 and 771.86 is: 1,157.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,620.68 : 3,931.02 = 771.86 : x
  2. Step 2: Convert to fraction form
    2,620.68/3,931.02 = 771.86/x
  3. Step 3: Cross multiply
    2,620.68x = 3,931.02 × 771.86
  4. Step 4: Simplify right side
    2,620.68x = 3,034,197.10
  5. Step 5: Solve for x
    x = 3,034,197.10/2,620.68
  6. Step 6: Final answer
    x = 1,157.79

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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.