Home / 20,121.55-27,755.12-12,960.74

Finding the Fourth Proportional to 20,121.55, 27,755.12 and 12,960.74

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Solution

The fourth proportional to 20,121.55, 27,755.12 and 12,960.74 is: 17,877.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.55 : 27,755.12 = 12,960.74 : x
  2. Step 2: Convert to fraction form
    20,121.55/27,755.12 = 12,960.74/x
  3. Step 3: Cross multiply
    20,121.55x = 27,755.12 × 12,960.74
  4. Step 4: Simplify right side
    20,121.55x = 359,726,995.78
  5. Step 5: Solve for x
    x = 359,726,995.78/20,121.55
  6. Step 6: Final answer
    x = 17,877.70

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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.