Home / 20,720.29-28,603.58-12,219.54

Finding the Fourth Proportional to 20,720.29, 28,603.58 and 12,219.54

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Solution

The fourth proportional to 20,720.29, 28,603.58 and 12,219.54 is: 16,868.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,720.29 : 28,603.58 = 12,219.54 : x
  2. Step 2: Convert to fraction form
    20,720.29/28,603.58 = 12,219.54/x
  3. Step 3: Cross multiply
    20,720.29x = 28,603.58 × 12,219.54
  4. Step 4: Simplify right side
    20,720.29x = 349,522,589.95
  5. Step 5: Solve for x
    x = 349,522,589.95/20,720.29
  6. Step 6: Final answer
    x = 16,868.61

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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.