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Finding the Fourth Proportional to 13,405.08, 18,500.60 and 7,741.20

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Solution

The fourth proportional to 13,405.08, 18,500.60 and 7,741.20 is: 10,683.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,405.08 : 18,500.60 = 7,741.20 : x
  2. Step 2: Convert to fraction form
    13,405.08/18,500.60 = 7,741.20/x
  3. Step 3: Cross multiply
    13,405.08x = 18,500.60 × 7,741.20
  4. Step 4: Simplify right side
    13,405.08x = 143,216,947.97
  5. Step 5: Solve for x
    x = 143,216,947.97/13,405.08
  6. Step 6: Final answer
    x = 10,683.78

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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.