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Finding the Fourth Proportional to 13,191.80, 18,204.08 and 7,889.54

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Solution

The fourth proportional to 13,191.80, 18,204.08 and 7,889.54 is: 10,887.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,191.80 : 18,204.08 = 7,889.54 : x
  2. Step 2: Convert to fraction form
    13,191.80/18,204.08 = 7,889.54/x
  3. Step 3: Cross multiply
    13,191.80x = 18,204.08 × 7,889.54
  4. Step 4: Simplify right side
    13,191.80x = 143,621,686.86
  5. Step 5: Solve for x
    x = 143,621,686.86/13,191.80
  6. Step 6: Final answer
    x = 10,887.20

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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.