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Finding the Fourth Proportional to 279,580.12, 418,739.28 and 129,505.12

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Solution

The fourth proportional to 279,580.12, 418,739.28 and 129,505.12 is: 193,965.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,580.12 : 418,739.28 = 129,505.12 : x
  2. Step 2: Convert to fraction form
    279,580.12/418,739.28 = 129,505.12/x
  3. Step 3: Cross multiply
    279,580.12x = 418,739.28 × 129,505.12
  4. Step 4: Simplify right side
    279,580.12x = 54,228,880,705.11
  5. Step 5: Solve for x
    x = 54,228,880,705.11/279,580.12
  6. Step 6: Final answer
    x = 193,965.44

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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.