Home / 20,810.20-31,215.30-8,336.20

Finding the Fourth Proportional to 20,810.20, 31,215.30 and 8,336.20

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Solution

The fourth proportional to 20,810.20, 31,215.30 and 8,336.20 is: 12,504.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.20 : 31,215.30 = 8,336.20 : x
  2. Step 2: Convert to fraction form
    20,810.20/31,215.30 = 8,336.20/x
  3. Step 3: Cross multiply
    20,810.20x = 31,215.30 × 8,336.20
  4. Step 4: Simplify right side
    20,810.20x = 260,216,983.86
  5. Step 5: Solve for x
    x = 260,216,983.86/20,810.20
  6. Step 6: Final answer
    x = 12,504.30

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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.