Home / 13,170.90-18,180.81-7,863.78

Finding the Fourth Proportional to 13,170.90, 18,180.81 and 7,863.78

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Solution

The fourth proportional to 13,170.90, 18,180.81 and 7,863.78 is: 10,854.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,170.90 : 18,180.81 = 7,863.78 : x
  2. Step 2: Convert to fraction form
    13,170.90/18,180.81 = 7,863.78/x
  3. Step 3: Cross multiply
    13,170.90x = 18,180.81 × 7,863.78
  4. Step 4: Simplify right side
    13,170.90x = 142,969,890.06
  5. Step 5: Solve for x
    x = 142,969,890.06/13,170.90
  6. Step 6: Final answer
    x = 10,854.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.