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Finding the Fourth Proportional to 11,138.80, 16,708.20 and 10,490.80

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Solution

The fourth proportional to 11,138.80, 16,708.20 and 10,490.80 is: 15,736.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,138.80 : 16,708.20 = 10,490.80 : x
  2. Step 2: Convert to fraction form
    11,138.80/16,708.20 = 10,490.80/x
  3. Step 3: Cross multiply
    11,138.80x = 16,708.20 × 10,490.80
  4. Step 4: Simplify right side
    11,138.80x = 175,282,384.56
  5. Step 5: Solve for x
    x = 175,282,384.56/11,138.80
  6. Step 6: Final answer
    x = 15,736.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.