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Finding the Fourth Proportional to 18,783.45, 25,919.42 and 11,228.31

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Solution

The fourth proportional to 18,783.45, 25,919.42 and 11,228.31 is: 15,494.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,783.45 : 25,919.42 = 11,228.31 : x
  2. Step 2: Convert to fraction form
    18,783.45/25,919.42 = 11,228.31/x
  3. Step 3: Cross multiply
    18,783.45x = 25,919.42 × 11,228.31
  4. Step 4: Simplify right side
    18,783.45x = 291,031,226.64
  5. Step 5: Solve for x
    x = 291,031,226.64/18,783.45
  6. Step 6: Final answer
    x = 15,494.02

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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.