Home / 391,378,259.45-585,789,922.37-287,720,021.72

Finding the Fourth Proportional to 391,378,259.45, 585,789,922.37 and 287,720,021.72

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Solution

The fourth proportional to 391,378,259.45, 585,789,922.37 and 287,720,021.72 is: 430,640,908.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,378,259.45 : 585,789,922.37 = 287,720,021.72 : x
  2. Step 2: Convert to fraction form
    391,378,259.45/585,789,922.37 = 287,720,021.72/x
  3. Step 3: Cross multiply
    391,378,259.45x = 585,789,922.37 × 287,720,021.72
  4. Step 4: Simplify right side
    391,378,259.45x = 168,543,489,187,653,536
  5. Step 5: Solve for x
    x = 168,543,489,187,653,536/391,378,259.45
  6. Step 6: Final answer
    x = 430,640,908.43

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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.