Home / 31,861.20-47,791.80-20,187.60

Finding the Fourth Proportional to 31,861.20, 47,791.80 and 20,187.60

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Solution

The fourth proportional to 31,861.20, 47,791.80 and 20,187.60 is: 30,281.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,861.20 : 47,791.80 = 20,187.60 : x
  2. Step 2: Convert to fraction form
    31,861.20/47,791.80 = 20,187.60/x
  3. Step 3: Cross multiply
    31,861.20x = 47,791.80 × 20,187.60
  4. Step 4: Simplify right side
    31,861.20x = 964,801,741.68
  5. Step 5: Solve for x
    x = 964,801,741.68/31,861.20
  6. Step 6: Final answer
    x = 30,281.40

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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.