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Finding the Fourth Proportional to 206,913.36, 310,421.88 and 66,668.88

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Solution

The fourth proportional to 206,913.36, 310,421.88 and 66,668.88 is: 100,020.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,913.36 : 310,421.88 = 66,668.88 : x
  2. Step 2: Convert to fraction form
    206,913.36/310,421.88 = 66,668.88/x
  3. Step 3: Cross multiply
    206,913.36x = 310,421.88 × 66,668.88
  4. Step 4: Simplify right side
    206,913.36x = 20,695,479,067.09
  5. Step 5: Solve for x
    x = 20,695,479,067.09/206,913.36
  6. Step 6: Final answer
    x = 100,020.02

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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.