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Finding the Fourth Proportional to 206,608.80, 309,956.40 and 66,381.60

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Solution

The fourth proportional to 206,608.80, 309,956.40 and 66,381.60 is: 99,586.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,608.80 : 309,956.40 = 66,381.60 : x
  2. Step 2: Convert to fraction form
    206,608.80/309,956.40 = 66,381.60/x
  3. Step 3: Cross multiply
    206,608.80x = 309,956.40 × 66,381.60
  4. Step 4: Simplify right side
    206,608.80x = 20,575,401,762.24
  5. Step 5: Solve for x
    x = 20,575,401,762.24/206,608.80
  6. Step 6: Final answer
    x = 99,586.28

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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.