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Finding the Fourth Proportional to 18,765.12, 28,121.36 and 14,586

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Solution

The fourth proportional to 18,765.12, 28,121.36 and 14,586 is: 21,858.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,765.12 : 28,121.36 = 14,586 : x
  2. Step 2: Convert to fraction form
    18,765.12/28,121.36 = 14,586/x
  3. Step 3: Cross multiply
    18,765.12x = 28,121.36 × 14,586
  4. Step 4: Simplify right side
    18,765.12x = 410,178,156.96
  5. Step 5: Solve for x
    x = 410,178,156.96/18,765.12
  6. Step 6: Final answer
    x = 21,858.54

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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.