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Finding the Fourth Proportional to 18,780.40, 25,919.40 and 10,822.96

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Solution

The fourth proportional to 18,780.40, 25,919.40 and 10,822.96 is: 14,937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.40 : 25,919.40 = 10,822.96 : x
  2. Step 2: Convert to fraction form
    18,780.40/25,919.40 = 10,822.96/x
  3. Step 3: Cross multiply
    18,780.40x = 25,919.40 × 10,822.96
  4. Step 4: Simplify right side
    18,780.40x = 280,524,629.42
  5. Step 5: Solve for x
    x = 280,524,629.42/18,780.40
  6. Step 6: Final answer
    x = 14,937.10

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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.