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Finding the Fourth Proportional to 15,336.95, 21,163.80 and 8,621.28

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Solution

The fourth proportional to 15,336.95, 21,163.80 and 8,621.28 is: 11,896.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,336.95 : 21,163.80 = 8,621.28 : x
  2. Step 2: Convert to fraction form
    15,336.95/21,163.80 = 8,621.28/x
  3. Step 3: Cross multiply
    15,336.95x = 21,163.80 × 8,621.28
  4. Step 4: Simplify right side
    15,336.95x = 182,459,045.66
  5. Step 5: Solve for x
    x = 182,459,045.66/15,336.95
  6. Step 6: Final answer
    x = 11,896.69

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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.