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Finding the Fourth Proportional to 12,890.20, 17,797.05 and 9,900.69

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Solution

The fourth proportional to 12,890.20, 17,797.05 and 9,900.69 is: 13,669.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,890.20 : 17,797.05 = 9,900.69 : x
  2. Step 2: Convert to fraction form
    12,890.20/17,797.05 = 9,900.69/x
  3. Step 3: Cross multiply
    12,890.20x = 17,797.05 × 9,900.69
  4. Step 4: Simplify right side
    12,890.20x = 176,203,074.96
  5. Step 5: Solve for x
    x = 176,203,074.96/12,890.20
  6. Step 6: Final answer
    x = 13,669.54

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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.