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Finding the Fourth Proportional to 18,819.18, 25,911.36 and 15,980.58

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Solution

The fourth proportional to 18,819.18, 25,911.36 and 15,980.58 is: 22,003.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.18 : 25,911.36 = 15,980.58 : x
  2. Step 2: Convert to fraction form
    18,819.18/25,911.36 = 15,980.58/x
  3. Step 3: Cross multiply
    18,819.18x = 25,911.36 × 15,980.58
  4. Step 4: Simplify right side
    18,819.18x = 414,078,561.39
  5. Step 5: Solve for x
    x = 414,078,561.39/18,819.18
  6. Step 6: Final answer
    x = 22,003.01

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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.