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Finding the Fourth Proportional to 2,078.81, 3,119.22 and 847.07

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Solution

The fourth proportional to 2,078.81, 3,119.22 and 847.07 is: 1,271.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,078.81 : 3,119.22 = 847.07 : x
  2. Step 2: Convert to fraction form
    2,078.81/3,119.22 = 847.07/x
  3. Step 3: Cross multiply
    2,078.81x = 3,119.22 × 847.07
  4. Step 4: Simplify right side
    2,078.81x = 2,642,197.69
  5. Step 5: Solve for x
    x = 2,642,197.69/2,078.81
  6. Step 6: Final answer
    x = 1,271.01

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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.