Home / 13,780.11-20,670.03-3,918.09

Finding the Fourth Proportional to 13,780.11, 20,670.03 and 3,918.09

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Solution

The fourth proportional to 13,780.11, 20,670.03 and 3,918.09 is: 5,877.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,780.11 : 20,670.03 = 3,918.09 : x
  2. Step 2: Convert to fraction form
    13,780.11/20,670.03 = 3,918.09/x
  3. Step 3: Cross multiply
    13,780.11x = 20,670.03 × 3,918.09
  4. Step 4: Simplify right side
    13,780.11x = 80,987,037.84
  5. Step 5: Solve for x
    x = 80,987,037.84/13,780.11
  6. Step 6: Final answer
    x = 5,877.10

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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.