Home / 20,860.85-31,288.84-8,380.37

Finding the Fourth Proportional to 20,860.85, 31,288.84 and 8,380.37

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Solution

The fourth proportional to 20,860.85, 31,288.84 and 8,380.37 is: 12,569.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.85 : 31,288.84 = 8,380.37 : x
  2. Step 2: Convert to fraction form
    20,860.85/31,288.84 = 8,380.37/x
  3. Step 3: Cross multiply
    20,860.85x = 31,288.84 × 8,380.37
  4. Step 4: Simplify right side
    20,860.85x = 262,212,056.07
  5. Step 5: Solve for x
    x = 262,212,056.07/20,860.85
  6. Step 6: Final answer
    x = 12,569.58

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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.