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Finding the Fourth Proportional to 221,278.60, 305,391.90 and 135,219.88

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Solution

The fourth proportional to 221,278.60, 305,391.90 and 135,219.88 is: 186,620.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,278.60 : 305,391.90 = 135,219.88 : x
  2. Step 2: Convert to fraction form
    221,278.60/305,391.90 = 135,219.88/x
  3. Step 3: Cross multiply
    221,278.60x = 305,391.90 × 135,219.88
  4. Step 4: Simplify right side
    221,278.60x = 41,295,056,070.97
  5. Step 5: Solve for x
    x = 41,295,056,070.97/221,278.60
  6. Step 6: Final answer
    x = 186,620.20

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1.5x scale

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.