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Finding the Fourth Proportional to 281,119.90, 421,679.85 and 81,446.80

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Solution

The fourth proportional to 281,119.90, 421,679.85 and 81,446.80 is: 122,170.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,119.90 : 421,679.85 = 81,446.80 : x
  2. Step 2: Convert to fraction form
    281,119.90/421,679.85 = 81,446.80/x
  3. Step 3: Cross multiply
    281,119.90x = 421,679.85 × 81,446.80
  4. Step 4: Simplify right side
    281,119.90x = 34,344,474,406.98
  5. Step 5: Solve for x
    x = 34,344,474,406.98/281,119.90
  6. Step 6: Final answer
    x = 122,170.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.