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Finding the Fourth Proportional to 15,156, 20,908.40 and 8,865.60

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Solution

The fourth proportional to 15,156, 20,908.40 and 8,865.60 is: 12,230.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,156 : 20,908.40 = 8,865.60 : x
  2. Step 2: Convert to fraction form
    15,156/20,908.40 = 8,865.60/x
  3. Step 3: Cross multiply
    15,156x = 20,908.40 × 8,865.60
  4. Step 4: Simplify right side
    15,156x = 185,365,511.04
  5. Step 5: Solve for x
    x = 185,365,511.04/15,156
  6. Step 6: Final answer
    x = 12,230.50

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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.