Home / 21,139.46-31,672.58-11,129.40

Finding the Fourth Proportional to 21,139.46, 31,672.58 and 11,129.40

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Solution

The fourth proportional to 21,139.46, 31,672.58 and 11,129.40 is: 16,674.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.46 : 31,672.58 = 11,129.40 : x
  2. Step 2: Convert to fraction form
    21,139.46/31,672.58 = 11,129.40/x
  3. Step 3: Cross multiply
    21,139.46x = 31,672.58 × 11,129.40
  4. Step 4: Simplify right side
    21,139.46x = 352,496,811.85
  5. Step 5: Solve for x
    x = 352,496,811.85/21,139.46
  6. Step 6: Final answer
    x = 16,674.83

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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.