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Finding the Fourth Proportional to 25,928.80, 38,878.80 and 11,135.20

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Solution

The fourth proportional to 25,928.80, 38,878.80 and 11,135.20 is: 16,696.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,928.80 : 38,878.80 = 11,135.20 : x
  2. Step 2: Convert to fraction form
    25,928.80/38,878.80 = 11,135.20/x
  3. Step 3: Cross multiply
    25,928.80x = 38,878.80 × 11,135.20
  4. Step 4: Simplify right side
    25,928.80x = 432,923,213.76
  5. Step 5: Solve for x
    x = 432,923,213.76/25,928.80
  6. Step 6: Final answer
    x = 16,696.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.