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Finding the Fourth Proportional to 279,005.40, 418,509.32 and 68,642.73

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Solution

The fourth proportional to 279,005.40, 418,509.32 and 68,642.73 is: 102,964.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,005.40 : 418,509.32 = 68,642.73 : x
  2. Step 2: Convert to fraction form
    279,005.40/418,509.32 = 68,642.73/x
  3. Step 3: Cross multiply
    279,005.40x = 418,509.32 × 68,642.73
  4. Step 4: Simplify right side
    279,005.40x = 28,727,621,912.03
  5. Step 5: Solve for x
    x = 28,727,621,912.03/279,005.40
  6. Step 6: Final answer
    x = 102,964.39

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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.