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Finding the Fourth Proportional to 18,813.72, 28,214.82 and 13,007.64

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Solution

The fourth proportional to 18,813.72, 28,214.82 and 13,007.64 is: 19,507.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,813.72 : 28,214.82 = 13,007.64 : x
  2. Step 2: Convert to fraction form
    18,813.72/28,214.82 = 13,007.64/x
  3. Step 3: Cross multiply
    18,813.72x = 28,214.82 × 13,007.64
  4. Step 4: Simplify right side
    18,813.72x = 367,008,221.22
  5. Step 5: Solve for x
    x = 367,008,221.22/18,813.72
  6. Step 6: Final answer
    x = 19,507.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.