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Finding the Fourth Proportional to 11,995.80, 17,991.66 and 5,420.46

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Solution

The fourth proportional to 11,995.80, 17,991.66 and 5,420.46 is: 8,129.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,995.80 : 17,991.66 = 5,420.46 : x
  2. Step 2: Convert to fraction form
    11,995.80/17,991.66 = 5,420.46/x
  3. Step 3: Cross multiply
    11,995.80x = 17,991.66 × 5,420.46
  4. Step 4: Simplify right side
    11,995.80x = 97,523,073.36
  5. Step 5: Solve for x
    x = 97,523,073.36/11,995.80
  6. Step 6: Final answer
    x = 8,129.77

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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.