Home / 28,261.20-38,998.72-15,686

Finding the Fourth Proportional to 28,261.20, 38,998.72 and 15,686

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Solution

The fourth proportional to 28,261.20, 38,998.72 and 15,686 is: 21,645.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,261.20 : 38,998.72 = 15,686 : x
  2. Step 2: Convert to fraction form
    28,261.20/38,998.72 = 15,686/x
  3. Step 3: Cross multiply
    28,261.20x = 38,998.72 × 15,686
  4. Step 4: Simplify right side
    28,261.20x = 611,733,921.92
  5. Step 5: Solve for x
    x = 611,733,921.92/28,261.20
  6. Step 6: Final answer
    x = 21,645.72

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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.