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Finding the Fourth Proportional to 391,620.96, 540,435.60 and 221,887.44

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Solution

The fourth proportional to 391,620.96, 540,435.60 and 221,887.44 is: 306,203.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,620.96 : 540,435.60 = 221,887.44 : x
  2. Step 2: Convert to fraction form
    391,620.96/540,435.60 = 221,887.44/x
  3. Step 3: Cross multiply
    391,620.96x = 540,435.60 × 221,887.44
  4. Step 4: Simplify right side
    391,620.96x = 119,915,871,768.86
  5. Step 5: Solve for x
    x = 119,915,871,768.86/391,620.96
  6. Step 6: Final answer
    x = 306,203.92

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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.