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Finding the Fourth Proportional to 1,212.86, 1,817.72 and 864.26

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Solution

The fourth proportional to 1,212.86, 1,817.72 and 864.26 is: 1,295.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.86 : 1,817.72 = 864.26 : x
  2. Step 2: Convert to fraction form
    1,212.86/1,817.72 = 864.26/x
  3. Step 3: Cross multiply
    1,212.86x = 1,817.72 × 864.26
  4. Step 4: Simplify right side
    1,212.86x = 1,570,982.69
  5. Step 5: Solve for x
    x = 1,570,982.69/1,212.86
  6. Step 6: Final answer
    x = 1,295.27

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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.