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Finding the Fourth Proportional to 18,489.60, 25,524.16 and 11,420.16

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Solution

The fourth proportional to 18,489.60, 25,524.16 and 11,420.16 is: 15,765.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,489.60 : 25,524.16 = 11,420.16 : x
  2. Step 2: Convert to fraction form
    18,489.60/25,524.16 = 11,420.16/x
  3. Step 3: Cross multiply
    18,489.60x = 25,524.16 × 11,420.16
  4. Step 4: Simplify right side
    18,489.60x = 291,489,991.07
  5. Step 5: Solve for x
    x = 291,489,991.07/18,489.60
  6. Step 6: Final answer
    x = 15,765.08

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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.