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Finding the Fourth Proportional to 279,939.60, 420,346.80 and 161,841.60

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Solution

The fourth proportional to 279,939.60, 420,346.80 and 161,841.60 is: 243,015.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,939.60 : 420,346.80 = 161,841.60 : x
  2. Step 2: Convert to fraction form
    279,939.60/420,346.80 = 161,841.60/x
  3. Step 3: Cross multiply
    279,939.60x = 420,346.80 × 161,841.60
  4. Step 4: Simplify right side
    279,939.60x = 68,029,598,666.88
  5. Step 5: Solve for x
    x = 68,029,598,666.88/279,939.60
  6. Step 6: Final answer
    x = 243,015.27

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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.