Home / 427,021.38-640,609.92-142,684.86

Finding the Fourth Proportional to 427,021.38, 640,609.92 and 142,684.86

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Solution

The fourth proportional to 427,021.38, 640,609.92 and 142,684.86 is: 214,053.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,021.38 : 640,609.92 = 142,684.86 : x
  2. Step 2: Convert to fraction form
    427,021.38/640,609.92 = 142,684.86/x
  3. Step 3: Cross multiply
    427,021.38x = 640,609.92 × 142,684.86
  4. Step 4: Simplify right side
    427,021.38x = 91,405,336,749.81
  5. Step 5: Solve for x
    x = 91,405,336,749.81/427,021.38
  6. Step 6: Final answer
    x = 214,053.30

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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.