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Finding the Fourth Proportional to 280,680.40, 421,020.60 and 162,290.80

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Solution

The fourth proportional to 280,680.40, 421,020.60 and 162,290.80 is: 243,436.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,680.40 : 421,020.60 = 162,290.80 : x
  2. Step 2: Convert to fraction form
    280,680.40/421,020.60 = 162,290.80/x
  3. Step 3: Cross multiply
    280,680.40x = 421,020.60 × 162,290.80
  4. Step 4: Simplify right side
    280,680.40x = 68,327,769,990.48
  5. Step 5: Solve for x
    x = 68,327,769,990.48/280,680.40
  6. Step 6: Final answer
    x = 243,436.20

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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.