Home / 20,738.60-31,059.30-12,865.40

Finding the Fourth Proportional to 20,738.60, 31,059.30 and 12,865.40

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Solution

The fourth proportional to 20,738.60, 31,059.30 and 12,865.40 is: 19,267.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,738.60 : 31,059.30 = 12,865.40 : x
  2. Step 2: Convert to fraction form
    20,738.60/31,059.30 = 12,865.40/x
  3. Step 3: Cross multiply
    20,738.60x = 31,059.30 × 12,865.40
  4. Step 4: Simplify right side
    20,738.60x = 399,590,318.22
  5. Step 5: Solve for x
    x = 399,590,318.22/20,738.60
  6. Step 6: Final answer
    x = 19,267.95

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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.