Home / 20,905.86-31,358.37-8,425.54

Finding the Fourth Proportional to 20,905.86, 31,358.37 and 8,425.54

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Solution

The fourth proportional to 20,905.86, 31,358.37 and 8,425.54 is: 12,638.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.86 : 31,358.37 = 8,425.54 : x
  2. Step 2: Convert to fraction form
    20,905.86/31,358.37 = 8,425.54/x
  3. Step 3: Cross multiply
    20,905.86x = 31,358.37 × 8,425.54
  4. Step 4: Simplify right side
    20,905.86x = 264,211,043.98
  5. Step 5: Solve for x
    x = 264,211,043.98/20,905.86
  6. Step 6: Final answer
    x = 12,638.13

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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.