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Finding the Fourth Proportional to 15,199.26, 20,979.99 and 8,911.50

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Solution

The fourth proportional to 15,199.26, 20,979.99 and 8,911.50 is: 12,300.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,199.26 : 20,979.99 = 8,911.50 : x
  2. Step 2: Convert to fraction form
    15,199.26/20,979.99 = 8,911.50/x
  3. Step 3: Cross multiply
    15,199.26x = 20,979.99 × 8,911.50
  4. Step 4: Simplify right side
    15,199.26x = 186,963,180.89
  5. Step 5: Solve for x
    x = 186,963,180.89/15,199.26
  6. Step 6: Final answer
    x = 12,300.81

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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.