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Finding the Fourth Proportional to 11,979.76, 17,970.44 and 4,079.02

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Solution

The fourth proportional to 11,979.76, 17,970.44 and 4,079.02 is: 6,118.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,979.76 : 17,970.44 = 4,079.02 : x
  2. Step 2: Convert to fraction form
    11,979.76/17,970.44 = 4,079.02/x
  3. Step 3: Cross multiply
    11,979.76x = 17,970.44 × 4,079.02
  4. Step 4: Simplify right side
    11,979.76x = 73,301,784.17
  5. Step 5: Solve for x
    x = 73,301,784.17/11,979.76
  6. Step 6: Final answer
    x = 6,118.80

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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.