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Finding the Fourth Proportional to 15,812.88, 21,821.16 and 8,739.18

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Solution

The fourth proportional to 15,812.88, 21,821.16 and 8,739.18 is: 12,059.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,812.88 : 21,821.16 = 8,739.18 : x
  2. Step 2: Convert to fraction form
    15,812.88/21,821.16 = 8,739.18/x
  3. Step 3: Cross multiply
    15,812.88x = 21,821.16 × 8,739.18
  4. Step 4: Simplify right side
    15,812.88x = 190,699,045.05
  5. Step 5: Solve for x
    x = 190,699,045.05/15,812.88
  6. Step 6: Final answer
    x = 12,059.73

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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.