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Finding the Fourth Proportional to 391,720.84, 540,544.26 and 221,981.56

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Solution

The fourth proportional to 391,720.84, 540,544.26 and 221,981.56 is: 306,317.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,720.84 : 540,544.26 = 221,981.56 : x
  2. Step 2: Convert to fraction form
    391,720.84/540,544.26 = 221,981.56/x
  3. Step 3: Cross multiply
    391,720.84x = 540,544.26 × 221,981.56
  4. Step 4: Simplify right side
    391,720.84x = 119,990,858,083.85
  5. Step 5: Solve for x
    x = 119,990,858,083.85/391,720.84
  6. Step 6: Final answer
    x = 306,317.27

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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.