Home / 20,786.20-31,156.26-12,477.40

Finding the Fourth Proportional to 20,786.20, 31,156.26 and 12,477.40

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Solution

The fourth proportional to 20,786.20, 31,156.26 and 12,477.40 is: 18,702.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.20 : 31,156.26 = 12,477.40 : x
  2. Step 2: Convert to fraction form
    20,786.20/31,156.26 = 12,477.40/x
  3. Step 3: Cross multiply
    20,786.20x = 31,156.26 × 12,477.40
  4. Step 4: Simplify right side
    20,786.20x = 388,749,118.52
  5. Step 5: Solve for x
    x = 388,749,118.52/20,786.20
  6. Step 6: Final answer
    x = 18,702.27

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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.