Home / 20,728.80-31,093.02-12,411.18

Finding the Fourth Proportional to 20,728.80, 31,093.02 and 12,411.18

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Solution

The fourth proportional to 20,728.80, 31,093.02 and 12,411.18 is: 18,616.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.80 : 31,093.02 = 12,411.18 : x
  2. Step 2: Convert to fraction form
    20,728.80/31,093.02 = 12,411.18/x
  3. Step 3: Cross multiply
    20,728.80x = 31,093.02 × 12,411.18
  4. Step 4: Simplify right side
    20,728.80x = 385,901,067.96
  5. Step 5: Solve for x
    x = 385,901,067.96/20,728.80
  6. Step 6: Final answer
    x = 18,616.66

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1.5x scale

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.