Home / 20,661.30-28,515.18-11,711.70

Finding the Fourth Proportional to 20,661.30, 28,515.18 and 11,711.70

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Solution

The fourth proportional to 20,661.30, 28,515.18 and 11,711.70 is: 16,163.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.30 : 28,515.18 = 11,711.70 : x
  2. Step 2: Convert to fraction form
    20,661.30/28,515.18 = 11,711.70/x
  3. Step 3: Cross multiply
    20,661.30x = 28,515.18 × 11,711.70
  4. Step 4: Simplify right side
    20,661.30x = 333,961,233.61
  5. Step 5: Solve for x
    x = 333,961,233.61/20,661.30
  6. Step 6: Final answer
    x = 16,163.61

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1.5x scale

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.