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Finding the Fourth Proportional to 391,804,623.88, 540,674,144.67 and 213,189,249.67

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Solution

The fourth proportional to 391,804,623.88, 540,674,144.67 and 213,189,249.67 is: 294,192,330.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,804,623.88 : 540,674,144.67 = 213,189,249.67 : x
  2. Step 2: Convert to fraction form
    391,804,623.88/540,674,144.67 = 213,189,249.67/x
  3. Step 3: Cross multiply
    391,804,623.88x = 540,674,144.67 × 213,189,249.67
  4. Step 4: Simplify right side
    391,804,623.88x = 115,265,915,216,814,624
  5. Step 5: Solve for x
    x = 115,265,915,216,814,624/391,804,623.88
  6. Step 6: Final answer
    x = 294,192,330.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.