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Finding the Fourth Proportional to 13,091, 18,059.60 and 7,782.80

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Solution

The fourth proportional to 13,091, 18,059.60 and 7,782.80 is: 10,736.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,091 : 18,059.60 = 7,782.80 : x
  2. Step 2: Convert to fraction form
    13,091/18,059.60 = 7,782.80/x
  3. Step 3: Cross multiply
    13,091x = 18,059.60 × 7,782.80
  4. Step 4: Simplify right side
    13,091x = 140,554,254.88
  5. Step 5: Solve for x
    x = 140,554,254.88/13,091
  6. Step 6: Final answer
    x = 10,736.71

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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.