Home / 20,518.61-28,315.23-12,019.68

Finding the Fourth Proportional to 20,518.61, 28,315.23 and 12,019.68

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Solution

The fourth proportional to 20,518.61, 28,315.23 and 12,019.68 is: 16,586.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,518.61 : 28,315.23 = 12,019.68 : x
  2. Step 2: Convert to fraction form
    20,518.61/28,315.23 = 12,019.68/x
  3. Step 3: Cross multiply
    20,518.61x = 28,315.23 × 12,019.68
  4. Step 4: Simplify right side
    20,518.61x = 340,340,003.73
  5. Step 5: Solve for x
    x = 340,340,003.73/20,518.61
  6. Step 6: Final answer
    x = 16,586.90

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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.