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Finding the Fourth Proportional to 206,421.40, 309,675.30 and 66,194.20

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Solution

The fourth proportional to 206,421.40, 309,675.30 and 66,194.20 is: 99,305.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,421.40 : 309,675.30 = 66,194.20 : x
  2. Step 2: Convert to fraction form
    206,421.40/309,675.30 = 66,194.20/x
  3. Step 3: Cross multiply
    206,421.40x = 309,675.30 × 66,194.20
  4. Step 4: Simplify right side
    206,421.40x = 20,498,708,743.26
  5. Step 5: Solve for x
    x = 20,498,708,743.26/206,421.40
  6. Step 6: Final answer
    x = 99,305.15

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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.