Home / 20,784.10-31,176.15-12,489.70

Finding the Fourth Proportional to 20,784.10, 31,176.15 and 12,489.70

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Solution

The fourth proportional to 20,784.10, 31,176.15 and 12,489.70 is: 18,734.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,784.10 : 31,176.15 = 12,489.70 : x
  2. Step 2: Convert to fraction form
    20,784.10/31,176.15 = 12,489.70/x
  3. Step 3: Cross multiply
    20,784.10x = 31,176.15 × 12,489.70
  4. Step 4: Simplify right side
    20,784.10x = 389,380,760.66
  5. Step 5: Solve for x
    x = 389,380,760.66/20,784.10
  6. Step 6: Final answer
    x = 18,734.55

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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.