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Finding the Fourth Proportional to 15,860.20, 21,888.42 and 8,788.84

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Solution

The fourth proportional to 15,860.20, 21,888.42 and 8,788.84 is: 12,129.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,860.20 : 21,888.42 = 8,788.84 : x
  2. Step 2: Convert to fraction form
    15,860.20/21,888.42 = 8,788.84/x
  3. Step 3: Cross multiply
    15,860.20x = 21,888.42 × 8,788.84
  4. Step 4: Simplify right side
    15,860.20x = 192,373,821.23
  5. Step 5: Solve for x
    x = 192,373,821.23/15,860.20
  6. Step 6: Final answer
    x = 12,129.34

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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.