Home / 20,771.91-31,139.26-7,621.22

Finding the Fourth Proportional to 20,771.91, 31,139.26 and 7,621.22

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Solution

The fourth proportional to 20,771.91, 31,139.26 and 7,621.22 is: 11,425.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,771.91 : 31,139.26 = 7,621.22 : x
  2. Step 2: Convert to fraction form
    20,771.91/31,139.26 = 7,621.22/x
  3. Step 3: Cross multiply
    20,771.91x = 31,139.26 × 7,621.22
  4. Step 4: Simplify right side
    20,771.91x = 237,319,209.89
  5. Step 5: Solve for x
    x = 237,319,209.89/20,771.91
  6. Step 6: Final answer
    x = 11,425.01

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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.