Home / 20,910.80-31,366.20-19,701.20

Finding the Fourth Proportional to 20,910.80, 31,366.20 and 19,701.20

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Solution

The fourth proportional to 20,910.80, 31,366.20 and 19,701.20 is: 29,551.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.80 : 31,366.20 = 19,701.20 : x
  2. Step 2: Convert to fraction form
    20,910.80/31,366.20 = 19,701.20/x
  3. Step 3: Cross multiply
    20,910.80x = 31,366.20 × 19,701.20
  4. Step 4: Simplify right side
    20,910.80x = 617,951,779.44
  5. Step 5: Solve for x
    x = 617,951,779.44/20,910.80
  6. Step 6: Final answer
    x = 29,551.80

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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.