Home / 20,107.40-30,171.90-8,421.80

Finding the Fourth Proportional to 20,107.40, 30,171.90 and 8,421.80

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Solution

The fourth proportional to 20,107.40, 30,171.90 and 8,421.80 is: 12,637.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,107.40 : 30,171.90 = 8,421.80 : x
  2. Step 2: Convert to fraction form
    20,107.40/30,171.90 = 8,421.80/x
  3. Step 3: Cross multiply
    20,107.40x = 30,171.90 × 8,421.80
  4. Step 4: Simplify right side
    20,107.40x = 254,101,707.42
  5. Step 5: Solve for x
    x = 254,101,707.42/20,107.40
  6. Step 6: Final answer
    x = 12,637.22

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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.