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Finding the Fourth Proportional to 11,121.90, 16,658.55 and 9,890.70

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Solution

The fourth proportional to 11,121.90, 16,658.55 and 9,890.70 is: 14,814.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,121.90 : 16,658.55 = 9,890.70 : x
  2. Step 2: Convert to fraction form
    11,121.90/16,658.55 = 9,890.70/x
  3. Step 3: Cross multiply
    11,121.90x = 16,658.55 × 9,890.70
  4. Step 4: Simplify right side
    11,121.90x = 164,764,720.49
  5. Step 5: Solve for x
    x = 164,764,720.49/11,121.90
  6. Step 6: Final answer
    x = 14,814.44

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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.