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Finding the Fourth Proportional to 206,563.60, 309,931.80 and 66,365.20

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Solution

The fourth proportional to 206,563.60, 309,931.80 and 66,365.20 is: 99,575.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,563.60 : 309,931.80 = 66,365.20 : x
  2. Step 2: Convert to fraction form
    206,563.60/309,931.80 = 66,365.20/x
  3. Step 3: Cross multiply
    206,563.60x = 309,931.80 × 66,365.20
  4. Step 4: Simplify right side
    206,563.60x = 20,568,685,893.36
  5. Step 5: Solve for x
    x = 20,568,685,893.36/206,563.60
  6. Step 6: Final answer
    x = 99,575.56

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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.