Home / 20,920.58-31,380.48-8,440.28

Finding the Fourth Proportional to 20,920.58, 31,380.48 and 8,440.28

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Solution

The fourth proportional to 20,920.58, 31,380.48 and 8,440.28 is: 12,660.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.58 : 31,380.48 = 8,440.28 : x
  2. Step 2: Convert to fraction form
    20,920.58/31,380.48 = 8,440.28/x
  3. Step 3: Cross multiply
    20,920.58x = 31,380.48 × 8,440.28
  4. Step 4: Simplify right side
    20,920.58x = 264,860,037.73
  5. Step 5: Solve for x
    x = 264,860,037.73/20,920.58
  6. Step 6: Final answer
    x = 12,660.26

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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.