Home / 20,783.20-31,174.80-8,305.15

Finding the Fourth Proportional to 20,783.20, 31,174.80 and 8,305.15

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Solution

The fourth proportional to 20,783.20, 31,174.80 and 8,305.15 is: 12,457.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.20 : 31,174.80 = 8,305.15 : x
  2. Step 2: Convert to fraction form
    20,783.20/31,174.80 = 8,305.15/x
  3. Step 3: Cross multiply
    20,783.20x = 31,174.80 × 8,305.15
  4. Step 4: Simplify right side
    20,783.20x = 258,911,390.22
  5. Step 5: Solve for x
    x = 258,911,390.22/20,783.20
  6. Step 6: Final answer
    x = 12,457.73

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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.