Home / 20,421.18-30,579.19-12,107.07

Finding the Fourth Proportional to 20,421.18, 30,579.19 and 12,107.07

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Solution

The fourth proportional to 20,421.18, 30,579.19 and 12,107.07 is: 18,129.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,421.18 : 30,579.19 = 12,107.07 : x
  2. Step 2: Convert to fraction form
    20,421.18/30,579.19 = 12,107.07/x
  3. Step 3: Cross multiply
    20,421.18x = 30,579.19 × 12,107.07
  4. Step 4: Simplify right side
    20,421.18x = 370,224,363.61
  5. Step 5: Solve for x
    x = 370,224,363.61/20,421.18
  6. Step 6: Final answer
    x = 18,129.43

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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.