Home / 20,518.92-28,315.44-12,969.30

Finding the Fourth Proportional to 20,518.92, 28,315.44 and 12,969.30

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Solution

The fourth proportional to 20,518.92, 28,315.44 and 12,969.30 is: 17,897.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.92 : 28,315.44 = 12,969.30 : x
  2. Step 2: Convert to fraction form
    20,518.92/28,315.44 = 12,969.30/x
  3. Step 3: Cross multiply
    20,518.92x = 28,315.44 × 12,969.30
  4. Step 4: Simplify right side
    20,518.92x = 367,231,435.99
  5. Step 5: Solve for x
    x = 367,231,435.99/20,518.92
  6. Step 6: Final answer
    x = 17,897.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.