Home / 20,387.88-28,129.90-11,771.94

Finding the Fourth Proportional to 20,387.88, 28,129.90 and 11,771.94

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Solution

The fourth proportional to 20,387.88, 28,129.90 and 11,771.94 is: 16,242.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.88 : 28,129.90 = 11,771.94 : x
  2. Step 2: Convert to fraction form
    20,387.88/28,129.90 = 11,771.94/x
  3. Step 3: Cross multiply
    20,387.88x = 28,129.90 × 11,771.94
  4. Step 4: Simplify right side
    20,387.88x = 331,143,495.01
  5. Step 5: Solve for x
    x = 331,143,495.01/20,387.88
  6. Step 6: Final answer
    x = 16,242.17

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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.