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Finding the Fourth Proportional to 11,390.80, 17,086.20 and 8,256.10

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Solution

The fourth proportional to 11,390.80, 17,086.20 and 8,256.10 is: 12,384.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,390.80 : 17,086.20 = 8,256.10 : x
  2. Step 2: Convert to fraction form
    11,390.80/17,086.20 = 8,256.10/x
  3. Step 3: Cross multiply
    11,390.80x = 17,086.20 × 8,256.10
  4. Step 4: Simplify right side
    11,390.80x = 141,065,375.82
  5. Step 5: Solve for x
    x = 141,065,375.82/11,390.80
  6. Step 6: Final answer
    x = 12,384.15

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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.