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Finding the Fourth Proportional to 339,785.65, 509,739.99 and 139,995.01

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Solution

The fourth proportional to 339,785.65, 509,739.99 and 139,995.01 is: 210,017.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,785.65 : 509,739.99 = 139,995.01 : x
  2. Step 2: Convert to fraction form
    339,785.65/509,739.99 = 139,995.01/x
  3. Step 3: Cross multiply
    339,785.65x = 509,739.99 × 139,995.01
  4. Step 4: Simplify right side
    339,785.65x = 71,361,054,997.45
  5. Step 5: Solve for x
    x = 71,361,054,997.45/339,785.65
  6. Step 6: Final answer
    x = 210,017.86

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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.