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Finding the Fourth Proportional to 11,978.48, 17,966.87 and 4,480.61

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Solution

The fourth proportional to 11,978.48, 17,966.87 and 4,480.61 is: 6,720.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,978.48 : 17,966.87 = 4,480.61 : x
  2. Step 2: Convert to fraction form
    11,978.48/17,966.87 = 4,480.61/x
  3. Step 3: Cross multiply
    11,978.48x = 17,966.87 × 4,480.61
  4. Step 4: Simplify right side
    11,978.48x = 80,502,537.39
  5. Step 5: Solve for x
    x = 80,502,537.39/11,978.48
  6. Step 6: Final answer
    x = 6,720.60

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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.