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Finding the Fourth Proportional to 15,278, 21,084.45 and 8,989.16

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Solution

The fourth proportional to 15,278, 21,084.45 and 8,989.16 is: 12,405.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,278 : 21,084.45 = 8,989.16 : x
  2. Step 2: Convert to fraction form
    15,278/21,084.45 = 8,989.16/x
  3. Step 3: Cross multiply
    15,278x = 21,084.45 × 8,989.16
  4. Step 4: Simplify right side
    15,278x = 189,531,494.56
  5. Step 5: Solve for x
    x = 189,531,494.56/15,278
  6. Step 6: Final answer
    x = 12,405.52

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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.