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Finding the Fourth Proportional to 18,686.63, 28,035.99 and 11,189.00

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Solution

The fourth proportional to 18,686.63, 28,035.99 and 11,189.00 is: 16,787.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,686.63 : 28,035.99 = 11,189.00 : x
  2. Step 2: Convert to fraction form
    18,686.63/28,035.99 = 11,189.00/x
  3. Step 3: Cross multiply
    18,686.63x = 28,035.99 × 11,189.00
  4. Step 4: Simplify right side
    18,686.63x = 313,694,762.20
  5. Step 5: Solve for x
    x = 313,694,762.20/18,686.63
  6. Step 6: Final answer
    x = 16,787.12

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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.