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Finding the Fourth Proportional to 13,751.52, 18,978.48 and 8,087.28

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Solution

The fourth proportional to 13,751.52, 18,978.48 and 8,087.28 is: 11,161.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,751.52 : 18,978.48 = 8,087.28 : x
  2. Step 2: Convert to fraction form
    13,751.52/18,978.48 = 8,087.28/x
  3. Step 3: Cross multiply
    13,751.52x = 18,978.48 × 8,087.28
  4. Step 4: Simplify right side
    13,751.52x = 153,484,281.73
  5. Step 5: Solve for x
    x = 153,484,281.73/13,751.52
  6. Step 6: Final answer
    x = 11,161.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.