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Finding the Fourth Proportional to 2,659.74, 3,989.78 and 810.86

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Solution

The fourth proportional to 2,659.74, 3,989.78 and 810.86 is: 1,216.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,659.74 : 3,989.78 = 810.86 : x
  2. Step 2: Convert to fraction form
    2,659.74/3,989.78 = 810.86/x
  3. Step 3: Cross multiply
    2,659.74x = 3,989.78 × 810.86
  4. Step 4: Simplify right side
    2,659.74x = 3,235,156.77
  5. Step 5: Solve for x
    x = 3,235,156.77/2,659.74
  6. Step 6: Final answer
    x = 1,216.34

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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.