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Finding the Fourth Proportional to 15,356.80, 21,192.66 and 8,551

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Solution

The fourth proportional to 15,356.80, 21,192.66 and 8,551 is: 11,800.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,356.80 : 21,192.66 = 8,551 : x
  2. Step 2: Convert to fraction form
    15,356.80/21,192.66 = 8,551/x
  3. Step 3: Cross multiply
    15,356.80x = 21,192.66 × 8,551
  4. Step 4: Simplify right side
    15,356.80x = 181,218,435.66
  5. Step 5: Solve for x
    x = 181,218,435.66/15,356.80
  6. Step 6: Final answer
    x = 11,800.53

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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.