Home / 20,708.26-31,062.40-12,390.70

Finding the Fourth Proportional to 20,708.26, 31,062.40 and 12,390.70

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Solution

The fourth proportional to 20,708.26, 31,062.40 and 12,390.70 is: 18,586.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,708.26 : 31,062.40 = 12,390.70 : x
  2. Step 2: Convert to fraction form
    20,708.26/31,062.40 = 12,390.70/x
  3. Step 3: Cross multiply
    20,708.26x = 31,062.40 × 12,390.70
  4. Step 4: Simplify right side
    20,708.26x = 384,884,879.68
  5. Step 5: Solve for x
    x = 384,884,879.68/20,708.26
  6. Step 6: Final answer
    x = 18,586.06

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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.