Home / 28,388.06-39,178.61-15,642.56

Finding the Fourth Proportional to 28,388.06, 39,178.61 and 15,642.56

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Solution

The fourth proportional to 28,388.06, 39,178.61 and 15,642.56 is: 21,588.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,388.06 : 39,178.61 = 15,642.56 : x
  2. Step 2: Convert to fraction form
    28,388.06/39,178.61 = 15,642.56/x
  3. Step 3: Cross multiply
    28,388.06x = 39,178.61 × 15,642.56
  4. Step 4: Simplify right side
    28,388.06x = 612,853,757.64
  5. Step 5: Solve for x
    x = 612,853,757.64/28,388.06
  6. Step 6: Final answer
    x = 21,588.43

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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.