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Finding the Fourth Proportional to 12,659.88, 18,988.26 and 5,640

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Solution

The fourth proportional to 12,659.88, 18,988.26 and 5,640 is: 8,459.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,659.88 : 18,988.26 = 5,640 : x
  2. Step 2: Convert to fraction form
    12,659.88/18,988.26 = 5,640/x
  3. Step 3: Cross multiply
    12,659.88x = 18,988.26 × 5,640
  4. Step 4: Simplify right side
    12,659.88x = 107,093,786.40
  5. Step 5: Solve for x
    x = 107,093,786.40/12,659.88
  6. Step 6: Final answer
    x = 8,459.31

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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.