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Finding the Fourth Proportional to 20,992.80, 31,489.20 and 20,020.80

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Solution

The fourth proportional to 20,992.80, 31,489.20 and 20,020.80 is: 30,031.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.80 : 31,489.20 = 20,020.80 : x
  2. Step 2: Convert to fraction form
    20,992.80/31,489.20 = 20,020.80/x
  3. Step 3: Cross multiply
    20,992.80x = 31,489.20 × 20,020.80
  4. Step 4: Simplify right side
    20,992.80x = 630,438,975.36
  5. Step 5: Solve for x
    x = 630,438,975.36/20,992.80
  6. Step 6: Final answer
    x = 30,031.20

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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.