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Finding the Fourth Proportional to 2,659.47, 3,989.36 and 810.65

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Solution

The fourth proportional to 2,659.47, 3,989.36 and 810.65 is: 1,216.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,659.47 : 3,989.36 = 810.65 : x
  2. Step 2: Convert to fraction form
    2,659.47/3,989.36 = 810.65/x
  3. Step 3: Cross multiply
    2,659.47x = 3,989.36 × 810.65
  4. Step 4: Simplify right side
    2,659.47x = 3,233,974.68
  5. Step 5: Solve for x
    x = 3,233,974.68/2,659.47
  6. Step 6: Final answer
    x = 1,216.02

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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.