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Finding the Fourth Proportional to 18,418.80, 25,407.09 and 13,035.18

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Solution

The fourth proportional to 18,418.80, 25,407.09 and 13,035.18 is: 17,980.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,418.80 : 25,407.09 = 13,035.18 : x
  2. Step 2: Convert to fraction form
    18,418.80/25,407.09 = 13,035.18/x
  3. Step 3: Cross multiply
    18,418.80x = 25,407.09 × 13,035.18
  4. Step 4: Simplify right side
    18,418.80x = 331,185,991.43
  5. Step 5: Solve for x
    x = 331,185,991.43/18,418.80
  6. Step 6: Final answer
    x = 17,980.87

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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.