Home / 20,518.06-28,315.65-12,139.42

Finding the Fourth Proportional to 20,518.06, 28,315.65 and 12,139.42

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Solution

The fourth proportional to 20,518.06, 28,315.65 and 12,139.42 is: 16,752.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.06 : 28,315.65 = 12,139.42 : x
  2. Step 2: Convert to fraction form
    20,518.06/28,315.65 = 12,139.42/x
  3. Step 3: Cross multiply
    20,518.06x = 28,315.65 × 12,139.42
  4. Step 4: Simplify right side
    20,518.06x = 343,735,567.92
  5. Step 5: Solve for x
    x = 343,735,567.92/20,518.06
  6. Step 6: Final answer
    x = 16,752.83

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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.