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Finding the Fourth Proportional to 11,985.28, 17,956.02 and 8,690.20

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Solution

The fourth proportional to 11,985.28, 17,956.02 and 8,690.20 is: 13,019.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,985.28 : 17,956.02 = 8,690.20 : x
  2. Step 2: Convert to fraction form
    11,985.28/17,956.02 = 8,690.20/x
  3. Step 3: Cross multiply
    11,985.28x = 17,956.02 × 8,690.20
  4. Step 4: Simplify right side
    11,985.28x = 156,041,405.00
  5. Step 5: Solve for x
    x = 156,041,405.00/11,985.28
  6. Step 6: Final answer
    x = 13,019.42

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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.