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Finding the Fourth Proportional to 11,891.80, 16,410.90 and 7,175.08

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Solution

The fourth proportional to 11,891.80, 16,410.90 and 7,175.08 is: 9,901.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,891.80 : 16,410.90 = 7,175.08 : x
  2. Step 2: Convert to fraction form
    11,891.80/16,410.90 = 7,175.08/x
  3. Step 3: Cross multiply
    11,891.80x = 16,410.90 × 7,175.08
  4. Step 4: Simplify right side
    11,891.80x = 117,749,520.37
  5. Step 5: Solve for x
    x = 117,749,520.37/11,891.80
  6. Step 6: Final answer
    x = 9,901.74

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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.