Home / 20,771.50-31,107.59-11,979.76

Finding the Fourth Proportional to 20,771.50, 31,107.59 and 11,979.76

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Solution

The fourth proportional to 20,771.50, 31,107.59 and 11,979.76 is: 17,941.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,771.50 : 31,107.59 = 11,979.76 : x
  2. Step 2: Convert to fraction form
    20,771.50/31,107.59 = 11,979.76/x
  3. Step 3: Cross multiply
    20,771.50x = 31,107.59 × 11,979.76
  4. Step 4: Simplify right side
    20,771.50x = 372,661,402.48
  5. Step 5: Solve for x
    x = 372,661,402.48/20,771.50
  6. Step 6: Final answer
    x = 17,941.00

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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.