Home / 20,480.36-30,719.10-11,687.72

Finding the Fourth Proportional to 20,480.36, 30,719.10 and 11,687.72

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Solution

The fourth proportional to 20,480.36, 30,719.10 and 11,687.72 is: 17,530.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,480.36 : 30,719.10 = 11,687.72 : x
  2. Step 2: Convert to fraction form
    20,480.36/30,719.10 = 11,687.72/x
  3. Step 3: Cross multiply
    20,480.36x = 30,719.10 × 11,687.72
  4. Step 4: Simplify right side
    20,480.36x = 359,036,239.45
  5. Step 5: Solve for x
    x = 359,036,239.45/20,480.36
  6. Step 6: Final answer
    x = 17,530.76

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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.