Home / 20,905.72-31,361.52-6,115.78

Finding the Fourth Proportional to 20,905.72, 31,361.52 and 6,115.78

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Solution

The fourth proportional to 20,905.72, 31,361.52 and 6,115.78 is: 9,174.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.72 : 31,361.52 = 6,115.78 : x
  2. Step 2: Convert to fraction form
    20,905.72/31,361.52 = 6,115.78/x
  3. Step 3: Cross multiply
    20,905.72x = 31,361.52 × 6,115.78
  4. Step 4: Simplify right side
    20,905.72x = 191,800,156.79
  5. Step 5: Solve for x
    x = 191,800,156.79/20,905.72
  6. Step 6: Final answer
    x = 9,174.53

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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.