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Finding the Fourth Proportional to 11,430, 17,143.79 and 3,638.21

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Solution

The fourth proportional to 11,430, 17,143.79 and 3,638.21 is: 5,456.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,430 : 17,143.79 = 3,638.21 : x
  2. Step 2: Convert to fraction form
    11,430/17,143.79 = 3,638.21/x
  3. Step 3: Cross multiply
    11,430x = 17,143.79 × 3,638.21
  4. Step 4: Simplify right side
    11,430x = 62,372,708.22
  5. Step 5: Solve for x
    x = 62,372,708.22/11,430
  6. Step 6: Final answer
    x = 5,456.93

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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.