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Finding the Fourth Proportional to 206,645.40, 309,968.10 and 66,418.20

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Solution

The fourth proportional to 206,645.40, 309,968.10 and 66,418.20 is: 99,627.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,645.40 : 309,968.10 = 66,418.20 : x
  2. Step 2: Convert to fraction form
    206,645.40/309,968.10 = 66,418.20/x
  3. Step 3: Cross multiply
    206,645.40x = 309,968.10 × 66,418.20
  4. Step 4: Simplify right side
    206,645.40x = 20,587,523,259.42
  5. Step 5: Solve for x
    x = 20,587,523,259.42/206,645.40
  6. Step 6: Final answer
    x = 99,627.30

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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.