Home / 20,456.40-30,684.60-12,145.80

Finding the Fourth Proportional to 20,456.40, 30,684.60 and 12,145.80

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Solution

The fourth proportional to 20,456.40, 30,684.60 and 12,145.80 is: 18,218.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,456.40 : 30,684.60 = 12,145.80 : x
  2. Step 2: Convert to fraction form
    20,456.40/30,684.60 = 12,145.80/x
  3. Step 3: Cross multiply
    20,456.40x = 30,684.60 × 12,145.80
  4. Step 4: Simplify right side
    20,456.40x = 372,689,014.68
  5. Step 5: Solve for x
    x = 372,689,014.68/20,456.40
  6. Step 6: Final answer
    x = 18,218.70

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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.