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Finding the Fourth Proportional to 11,689.20, 17,512.20 and 10,911.60

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Solution

The fourth proportional to 11,689.20, 17,512.20 and 10,911.60 is: 16,347.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,689.20 : 17,512.20 = 10,911.60 : x
  2. Step 2: Convert to fraction form
    11,689.20/17,512.20 = 10,911.60/x
  3. Step 3: Cross multiply
    11,689.20x = 17,512.20 × 10,911.60
  4. Step 4: Simplify right side
    11,689.20x = 191,086,121.52
  5. Step 5: Solve for x
    x = 191,086,121.52/11,689.20
  6. Step 6: Final answer
    x = 16,347.24

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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.