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Finding the Fourth Proportional to 11,970.79, 17,956.16 and 5,389.28

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Solution

The fourth proportional to 11,970.79, 17,956.16 and 5,389.28 is: 8,083.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,970.79 : 17,956.16 = 5,389.28 : x
  2. Step 2: Convert to fraction form
    11,970.79/17,956.16 = 5,389.28/x
  3. Step 3: Cross multiply
    11,970.79x = 17,956.16 × 5,389.28
  4. Step 4: Simplify right side
    11,970.79x = 96,770,747.02
  5. Step 5: Solve for x
    x = 96,770,747.02/11,970.79
  6. Step 6: Final answer
    x = 8,083.91

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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.