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Finding the Fourth Proportional to 18,708.88, 25,819.32 and 11,153.20

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Solution

The fourth proportional to 18,708.88, 25,819.32 and 11,153.20 is: 15,392.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.88 : 25,819.32 = 11,153.20 : x
  2. Step 2: Convert to fraction form
    18,708.88/25,819.32 = 11,153.20/x
  3. Step 3: Cross multiply
    18,708.88x = 25,819.32 × 11,153.20
  4. Step 4: Simplify right side
    18,708.88x = 287,968,039.82
  5. Step 5: Solve for x
    x = 287,968,039.82/18,708.88
  6. Step 6: Final answer
    x = 15,392.05

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1.5x scale

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.