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Finding the Fourth Proportional to 2,661.12, 3,992.28 and 812.40

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Solution

The fourth proportional to 2,661.12, 3,992.28 and 812.40 is: 1,218.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.12 : 3,992.28 = 812.40 : x
  2. Step 2: Convert to fraction form
    2,661.12/3,992.28 = 812.40/x
  3. Step 3: Cross multiply
    2,661.12x = 3,992.28 × 812.40
  4. Step 4: Simplify right side
    2,661.12x = 3,243,328.27
  5. Step 5: Solve for x
    x = 3,243,328.27/2,661.12
  6. Step 6: Final answer
    x = 1,218.78

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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.