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Finding the Fourth Proportional to 11,989.68, 17,987.37 and 5,415.87

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Solution

The fourth proportional to 11,989.68, 17,987.37 and 5,415.87 is: 8,125.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,989.68 : 17,987.37 = 5,415.87 : x
  2. Step 2: Convert to fraction form
    11,989.68/17,987.37 = 5,415.87/x
  3. Step 3: Cross multiply
    11,989.68x = 17,987.37 × 5,415.87
  4. Step 4: Simplify right side
    11,989.68x = 97,417,257.56
  5. Step 5: Solve for x
    x = 97,417,257.56/11,989.68
  6. Step 6: Final answer
    x = 8,125.09

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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.