Home / 20,720.93-31,090.58-10,857.86

Finding the Fourth Proportional to 20,720.93, 31,090.58 and 10,857.86

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Solution

The fourth proportional to 20,720.93, 31,090.58 and 10,857.86 is: 16,291.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.93 : 31,090.58 = 10,857.86 : x
  2. Step 2: Convert to fraction form
    20,720.93/31,090.58 = 10,857.86/x
  3. Step 3: Cross multiply
    20,720.93x = 31,090.58 × 10,857.86
  4. Step 4: Simplify right side
    20,720.93x = 337,577,348.48
  5. Step 5: Solve for x
    x = 337,577,348.48/20,720.93
  6. Step 6: Final answer
    x = 16,291.61

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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.