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Finding the Fourth Proportional to 15,479, 21,361.42 and 8,405.42

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Solution

The fourth proportional to 15,479, 21,361.42 and 8,405.42 is: 11,599.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479 : 21,361.42 = 8,405.42 : x
  2. Step 2: Convert to fraction form
    15,479/21,361.42 = 8,405.42/x
  3. Step 3: Cross multiply
    15,479x = 21,361.42 × 8,405.42
  4. Step 4: Simplify right side
    15,479x = 179,551,706.90
  5. Step 5: Solve for x
    x = 179,551,706.90/15,479
  6. Step 6: Final answer
    x = 11,599.70

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Why These Related Problems?

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