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Finding the Fourth Proportional to 15,479.40, 21,361.82 and 8,405.82

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Solution

The fourth proportional to 15,479.40, 21,361.82 and 8,405.82 is: 11,600.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,479.40 : 21,361.82 = 8,405.82 : x
  2. Step 2: Convert to fraction form
    15,479.40/21,361.82 = 8,405.82/x
  3. Step 3: Cross multiply
    15,479.40x = 21,361.82 × 8,405.82
  4. Step 4: Simplify right side
    15,479.40x = 179,563,571.76
  5. Step 5: Solve for x
    x = 179,563,571.76/15,479.40
  6. Step 6: Final answer
    x = 11,600.16

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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.