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Finding the Fourth Proportional to 11,126.80, 16,690.20 and 8,648.20

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Solution

The fourth proportional to 11,126.80, 16,690.20 and 8,648.20 is: 12,972.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,126.80 : 16,690.20 = 8,648.20 : x
  2. Step 2: Convert to fraction form
    11,126.80/16,690.20 = 8,648.20/x
  3. Step 3: Cross multiply
    11,126.80x = 16,690.20 × 8,648.20
  4. Step 4: Simplify right side
    11,126.80x = 144,340,187.64
  5. Step 5: Solve for x
    x = 144,340,187.64/11,126.80
  6. Step 6: Final answer
    x = 12,972.30

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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.