Home / 20,680.12-31,038.56-13,640.44

Finding the Fourth Proportional to 20,680.12, 31,038.56 and 13,640.44

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Solution

The fourth proportional to 20,680.12, 31,038.56 and 13,640.44 is: 20,472.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.12 : 31,038.56 = 13,640.44 : x
  2. Step 2: Convert to fraction form
    20,680.12/31,038.56 = 13,640.44/x
  3. Step 3: Cross multiply
    20,680.12x = 31,038.56 × 13,640.44
  4. Step 4: Simplify right side
    20,680.12x = 423,379,615.37
  5. Step 5: Solve for x
    x = 423,379,615.37/20,680.12
  6. Step 6: Final answer
    x = 20,472.78

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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.