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Finding the Fourth Proportional to 15,198.85, 20,981.25 and 8,911.63

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Solution

The fourth proportional to 15,198.85, 20,981.25 and 8,911.63 is: 12,302.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,198.85 : 20,981.25 = 8,911.63 : x
  2. Step 2: Convert to fraction form
    15,198.85/20,981.25 = 8,911.63/x
  3. Step 3: Cross multiply
    15,198.85x = 20,981.25 × 8,911.63
  4. Step 4: Simplify right side
    15,198.85x = 186,976,987.47
  5. Step 5: Solve for x
    x = 186,976,987.47/15,198.85
  6. Step 6: Final answer
    x = 12,302.05

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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.