Home / 20,860.99-31,300.13-8,389.86

Finding the Fourth Proportional to 20,860.99, 31,300.13 and 8,389.86

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Solution

The fourth proportional to 20,860.99, 31,300.13 and 8,389.86 is: 12,588.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.99 : 31,300.13 = 8,389.86 : x
  2. Step 2: Convert to fraction form
    20,860.99/31,300.13 = 8,389.86/x
  3. Step 3: Cross multiply
    20,860.99x = 31,300.13 × 8,389.86
  4. Step 4: Simplify right side
    20,860.99x = 262,603,708.68
  5. Step 5: Solve for x
    x = 262,603,708.68/20,860.99
  6. Step 6: Final answer
    x = 12,588.27

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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.