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Finding the Fourth Proportional to 279,039.60, 418,540.20 and 89,497.20

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Solution

The fourth proportional to 279,039.60, 418,540.20 and 89,497.20 is: 134,239.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,039.60 : 418,540.20 = 89,497.20 : x
  2. Step 2: Convert to fraction form
    279,039.60/418,540.20 = 89,497.20/x
  3. Step 3: Cross multiply
    279,039.60x = 418,540.20 × 89,497.20
  4. Step 4: Simplify right side
    279,039.60x = 37,458,175,987.44
  5. Step 5: Solve for x
    x = 37,458,175,987.44/279,039.60
  6. Step 6: Final answer
    x = 134,239.64

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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.