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Finding the Fourth Proportional to 18,505.62, 25,507.17 and 13,788.18

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Solution

The fourth proportional to 18,505.62, 25,507.17 and 13,788.18 is: 19,004.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,505.62 : 25,507.17 = 13,788.18 : x
  2. Step 2: Convert to fraction form
    18,505.62/25,507.17 = 13,788.18/x
  3. Step 3: Cross multiply
    18,505.62x = 25,507.17 × 13,788.18
  4. Step 4: Simplify right side
    18,505.62x = 351,697,451.25
  5. Step 5: Solve for x
    x = 351,697,451.25/18,505.62
  6. Step 6: Final answer
    x = 19,004.90

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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.