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Finding the Fourth Proportional to 12,911.90, 17,816.94 and 7,245.90

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Solution

The fourth proportional to 12,911.90, 17,816.94 and 7,245.90 is: 9,998.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,911.90 : 17,816.94 = 7,245.90 : x
  2. Step 2: Convert to fraction form
    12,911.90/17,816.94 = 7,245.90/x
  3. Step 3: Cross multiply
    12,911.90x = 17,816.94 × 7,245.90
  4. Step 4: Simplify right side
    12,911.90x = 129,099,765.55
  5. Step 5: Solve for x
    x = 129,099,765.55/12,911.90
  6. Step 6: Final answer
    x = 9,998.51

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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.