Home / 20,910.40-28,855.76-11,478.96

Finding the Fourth Proportional to 20,910.40, 28,855.76 and 11,478.96

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Solution

The fourth proportional to 20,910.40, 28,855.76 and 11,478.96 is: 15,840.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.40 : 28,855.76 = 11,478.96 : x
  2. Step 2: Convert to fraction form
    20,910.40/28,855.76 = 11,478.96/x
  3. Step 3: Cross multiply
    20,910.40x = 28,855.76 × 11,478.96
  4. Step 4: Simplify right side
    20,910.40x = 331,234,114.81
  5. Step 5: Solve for x
    x = 331,234,114.81/20,910.40
  6. Step 6: Final answer
    x = 15,840.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.