Home / 20,392.89-28,142.25-11,900.85

Finding the Fourth Proportional to 20,392.89, 28,142.25 and 11,900.85

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Solution

The fourth proportional to 20,392.89, 28,142.25 and 11,900.85 is: 16,423.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,392.89 : 28,142.25 = 11,900.85 : x
  2. Step 2: Convert to fraction form
    20,392.89/28,142.25 = 11,900.85/x
  3. Step 3: Cross multiply
    20,392.89x = 28,142.25 × 11,900.85
  4. Step 4: Simplify right side
    20,392.89x = 334,916,695.91
  5. Step 5: Solve for x
    x = 334,916,695.91/20,392.89
  6. Step 6: Final answer
    x = 16,423.21

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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.