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Finding the Fourth Proportional to 11,967.60, 17,990.28 and 11,909.28

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Solution

The fourth proportional to 11,967.60, 17,990.28 and 11,909.28 is: 17,902.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,967.60 : 17,990.28 = 11,909.28 : x
  2. Step 2: Convert to fraction form
    11,967.60/17,990.28 = 11,909.28/x
  3. Step 3: Cross multiply
    11,967.60x = 17,990.28 × 11,909.28
  4. Step 4: Simplify right side
    11,967.60x = 214,251,281.80
  5. Step 5: Solve for x
    x = 214,251,281.80/11,967.60
  6. Step 6: Final answer
    x = 17,902.61

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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.