Home / 20,971.60-31,472.77-15,439.85

Finding the Fourth Proportional to 20,971.60, 31,472.77 and 15,439.85

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Solution

The fourth proportional to 20,971.60, 31,472.77 and 15,439.85 is: 23,171.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.60 : 31,472.77 = 15,439.85 : x
  2. Step 2: Convert to fraction form
    20,971.60/31,472.77 = 15,439.85/x
  3. Step 3: Cross multiply
    20,971.60x = 31,472.77 × 15,439.85
  4. Step 4: Simplify right side
    20,971.60x = 485,934,847.88
  5. Step 5: Solve for x
    x = 485,934,847.88/20,971.60
  6. Step 6: Final answer
    x = 23,171.09

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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.