Home / 20,868.30-31,330.26-12,109.50

Finding the Fourth Proportional to 20,868.30, 31,330.26 and 12,109.50

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Solution

The fourth proportional to 20,868.30, 31,330.26 and 12,109.50 is: 18,180.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,868.30 : 31,330.26 = 12,109.50 : x
  2. Step 2: Convert to fraction form
    20,868.30/31,330.26 = 12,109.50/x
  3. Step 3: Cross multiply
    20,868.30x = 31,330.26 × 12,109.50
  4. Step 4: Simplify right side
    20,868.30x = 379,393,783.47
  5. Step 5: Solve for x
    x = 379,393,783.47/20,868.30
  6. Step 6: Final answer
    x = 18,180.39

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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.