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Finding the Fourth Proportional to 391,632.84, 540,451.44 and 221,866.56

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Solution

The fourth proportional to 391,632.84, 540,451.44 and 221,866.56 is: 306,174.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,632.84 : 540,451.44 = 221,866.56 : x
  2. Step 2: Convert to fraction form
    391,632.84/540,451.44 = 221,866.56/x
  3. Step 3: Cross multiply
    391,632.84x = 540,451.44 × 221,866.56
  4. Step 4: Simplify right side
    391,632.84x = 119,908,101,839.85
  5. Step 5: Solve for x
    x = 119,908,101,839.85/391,632.84
  6. Step 6: Final answer
    x = 306,174.79

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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.