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Finding the Fourth Proportional to 18,711.77, 25,821.60 and 11,154.20

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Solution

The fourth proportional to 18,711.77, 25,821.60 and 11,154.20 is: 15,392.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.77 : 25,821.60 = 11,154.20 : x
  2. Step 2: Convert to fraction form
    18,711.77/25,821.60 = 11,154.20/x
  3. Step 3: Cross multiply
    18,711.77x = 25,821.60 × 11,154.20
  4. Step 4: Simplify right side
    18,711.77x = 288,019,290.72
  5. Step 5: Solve for x
    x = 288,019,290.72/18,711.77
  6. Step 6: Final answer
    x = 15,392.41

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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.