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Finding the Fourth Proportional to 281,638.20, 421,679.70 and 219,430.20

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Solution

The fourth proportional to 281,638.20, 421,679.70 and 219,430.20 is: 328,539.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,638.20 : 421,679.70 = 219,430.20 : x
  2. Step 2: Convert to fraction form
    281,638.20/421,679.70 = 219,430.20/x
  3. Step 3: Cross multiply
    281,638.20x = 421,679.70 × 219,430.20
  4. Step 4: Simplify right side
    281,638.20x = 92,529,260,906.94
  5. Step 5: Solve for x
    x = 92,529,260,906.94/281,638.20
  6. Step 6: Final answer
    x = 328,539.46

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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.