Home / 20,835.80-28,745.66-13,280.39

Finding the Fourth Proportional to 20,835.80, 28,745.66 and 13,280.39

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Solution

The fourth proportional to 20,835.80, 28,745.66 and 13,280.39 is: 18,322.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,835.80 : 28,745.66 = 13,280.39 : x
  2. Step 2: Convert to fraction form
    20,835.80/28,745.66 = 13,280.39/x
  3. Step 3: Cross multiply
    20,835.80x = 28,745.66 × 13,280.39
  4. Step 4: Simplify right side
    20,835.80x = 381,753,680.67
  5. Step 5: Solve for x
    x = 381,753,680.67/20,835.80
  6. Step 6: Final answer
    x = 18,322.01

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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.