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Finding the Fourth Proportional to 18,104.60, 25,018.65 and 13,620.57

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Solution

The fourth proportional to 18,104.60, 25,018.65 and 13,620.57 is: 18,822.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,104.60 : 25,018.65 = 13,620.57 : x
  2. Step 2: Convert to fraction form
    18,104.60/25,018.65 = 13,620.57/x
  3. Step 3: Cross multiply
    18,104.60x = 25,018.65 × 13,620.57
  4. Step 4: Simplify right side
    18,104.60x = 340,768,273.63
  5. Step 5: Solve for x
    x = 340,768,273.63/18,104.60
  6. Step 6: Final answer
    x = 18,822.20

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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.