Home / 20,720.24-31,080.33-5,137.86

Finding the Fourth Proportional to 20,720.24, 31,080.33 and 5,137.86

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Solution

The fourth proportional to 20,720.24, 31,080.33 and 5,137.86 is: 7,706.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.24 : 31,080.33 = 5,137.86 : x
  2. Step 2: Convert to fraction form
    20,720.24/31,080.33 = 5,137.86/x
  3. Step 3: Cross multiply
    20,720.24x = 31,080.33 × 5,137.86
  4. Step 4: Simplify right side
    20,720.24x = 159,686,384.29
  5. Step 5: Solve for x
    x = 159,686,384.29/20,720.24
  6. Step 6: Final answer
    x = 7,706.78

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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.