Home / 20,720.80-31,090.47-10,857.79

Finding the Fourth Proportional to 20,720.80, 31,090.47 and 10,857.79

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Solution

The fourth proportional to 20,720.80, 31,090.47 and 10,857.79 is: 16,291.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.80 : 31,090.47 = 10,857.79 : x
  2. Step 2: Convert to fraction form
    20,720.80/31,090.47 = 10,857.79/x
  3. Step 3: Cross multiply
    20,720.80x = 31,090.47 × 10,857.79
  4. Step 4: Simplify right side
    20,720.80x = 337,573,794.26
  5. Step 5: Solve for x
    x = 337,573,794.26/20,720.80
  6. Step 6: Final answer
    x = 16,291.54

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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.