Home / 13,180.60-19,770.90-12,611.80

Finding the Fourth Proportional to 13,180.60, 19,770.90 and 12,611.80

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Solution

The fourth proportional to 13,180.60, 19,770.90 and 12,611.80 is: 18,917.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,180.60 : 19,770.90 = 12,611.80 : x
  2. Step 2: Convert to fraction form
    13,180.60/19,770.90 = 12,611.80/x
  3. Step 3: Cross multiply
    13,180.60x = 19,770.90 × 12,611.80
  4. Step 4: Simplify right side
    13,180.60x = 249,346,636.62
  5. Step 5: Solve for x
    x = 249,346,636.62/13,180.60
  6. Step 6: Final answer
    x = 18,917.70

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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.