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Finding the Fourth Proportional to 206,621.40, 309,902.67 and 66,361.80

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Solution

The fourth proportional to 206,621.40, 309,902.67 and 66,361.80 is: 99,533.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,621.40 : 309,902.67 = 66,361.80 : x
  2. Step 2: Convert to fraction form
    206,621.40/309,902.67 = 66,361.80/x
  3. Step 3: Cross multiply
    206,621.40x = 309,902.67 × 66,361.80
  4. Step 4: Simplify right side
    206,621.40x = 20,565,699,006.01
  5. Step 5: Solve for x
    x = 20,565,699,006.01/206,621.40
  6. Step 6: Final answer
    x = 99,533.25

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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.