Home / 13,640.43-20,458.36-3,780.70

Finding the Fourth Proportional to 13,640.43, 20,458.36 and 3,780.70

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Solution

The fourth proportional to 13,640.43, 20,458.36 and 3,780.70 is: 5,670.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,640.43 : 20,458.36 = 3,780.70 : x
  2. Step 2: Convert to fraction form
    13,640.43/20,458.36 = 3,780.70/x
  3. Step 3: Cross multiply
    13,640.43x = 20,458.36 × 3,780.70
  4. Step 4: Simplify right side
    13,640.43x = 77,346,921.65
  5. Step 5: Solve for x
    x = 77,346,921.65/13,640.43
  6. Step 6: Final answer
    x = 5,670.42

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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.