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Finding the Fourth Proportional to 15,522.75, 21,421.31 and 8,809.65

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Solution

The fourth proportional to 15,522.75, 21,421.31 and 8,809.65 is: 12,157.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,522.75 : 21,421.31 = 8,809.65 : x
  2. Step 2: Convert to fraction form
    15,522.75/21,421.31 = 8,809.65/x
  3. Step 3: Cross multiply
    15,522.75x = 21,421.31 × 8,809.65
  4. Step 4: Simplify right side
    15,522.75x = 188,714,199.59
  5. Step 5: Solve for x
    x = 188,714,199.59/15,522.75
  6. Step 6: Final answer
    x = 12,157.27

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.