Home / 20,910.30-31,355.37-12,147.72

Finding the Fourth Proportional to 20,910.30, 31,355.37 and 12,147.72

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Solution

The fourth proportional to 20,910.30, 31,355.37 and 12,147.72 is: 18,215.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.30 : 31,355.37 = 12,147.72 : x
  2. Step 2: Convert to fraction form
    20,910.30/31,355.37 = 12,147.72/x
  3. Step 3: Cross multiply
    20,910.30x = 31,355.37 × 12,147.72
  4. Step 4: Simplify right side
    20,910.30x = 380,896,255.26
  5. Step 5: Solve for x
    x = 380,896,255.26/20,910.30
  6. Step 6: Final answer
    x = 18,215.72

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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.