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Finding the Fourth Proportional to 18,945.72, 28,409.94 and 9,089.64

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Solution

The fourth proportional to 18,945.72, 28,409.94 and 9,089.64 is: 13,630.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,945.72 : 28,409.94 = 9,089.64 : x
  2. Step 2: Convert to fraction form
    18,945.72/28,409.94 = 9,089.64/x
  3. Step 3: Cross multiply
    18,945.72x = 28,409.94 × 9,089.64
  4. Step 4: Simplify right side
    18,945.72x = 258,236,127.02
  5. Step 5: Solve for x
    x = 258,236,127.02/18,945.72
  6. Step 6: Final answer
    x = 13,630.31

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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.