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Finding the Fourth Proportional to 18,921.30, 28,399.44 and 9,567.90

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Solution

The fourth proportional to 18,921.30, 28,399.44 and 9,567.90 is: 14,360.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.30 : 28,399.44 = 9,567.90 : x
  2. Step 2: Convert to fraction form
    18,921.30/28,399.44 = 9,567.90/x
  3. Step 3: Cross multiply
    18,921.30x = 28,399.44 × 9,567.90
  4. Step 4: Simplify right side
    18,921.30x = 271,723,001.98
  5. Step 5: Solve for x
    x = 271,723,001.98/18,921.30
  6. Step 6: Final answer
    x = 14,360.69

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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.