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Finding the Fourth Proportional to 399,638.21, 599,457.69 and 111,438.34

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Solution

The fourth proportional to 399,638.21, 599,457.69 and 111,438.34 is: 167,157.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,638.21 : 599,457.69 = 111,438.34 : x
  2. Step 2: Convert to fraction form
    399,638.21/599,457.69 = 111,438.34/x
  3. Step 3: Cross multiply
    399,638.21x = 599,457.69 × 111,438.34
  4. Step 4: Simplify right side
    399,638.21x = 66,802,568,375.19
  5. Step 5: Solve for x
    x = 66,802,568,375.19/399,638.21
  6. Step 6: Final answer
    x = 167,157.61

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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.