Home / 20,380.90-28,125.62-12,423.10

Finding the Fourth Proportional to 20,380.90, 28,125.62 and 12,423.10

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Solution

The fourth proportional to 20,380.90, 28,125.62 and 12,423.10 is: 17,143.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.90 : 28,125.62 = 12,423.10 : x
  2. Step 2: Convert to fraction form
    20,380.90/28,125.62 = 12,423.10/x
  3. Step 3: Cross multiply
    20,380.90x = 28,125.62 × 12,423.10
  4. Step 4: Simplify right side
    20,380.90x = 349,407,389.82
  5. Step 5: Solve for x
    x = 349,407,389.82/20,380.90
  6. Step 6: Final answer
    x = 17,143.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.