Home / 20,960.99-31,401.87-12,386.86

Finding the Fourth Proportional to 20,960.99, 31,401.87 and 12,386.86

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Solution

The fourth proportional to 20,960.99, 31,401.87 and 12,386.86 is: 18,556.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,960.99 : 31,401.87 = 12,386.86 : x
  2. Step 2: Convert to fraction form
    20,960.99/31,401.87 = 12,386.86/x
  3. Step 3: Cross multiply
    20,960.99x = 31,401.87 × 12,386.86
  4. Step 4: Simplify right side
    20,960.99x = 388,970,567.43
  5. Step 5: Solve for x
    x = 388,970,567.43/20,960.99
  6. Step 6: Final answer
    x = 18,556.88

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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.