Home / 13,781.08-20,660.12-6,390.82

Finding the Fourth Proportional to 13,781.08, 20,660.12 and 6,390.82

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Solution

The fourth proportional to 13,781.08, 20,660.12 and 6,390.82 is: 9,580.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781.08 : 20,660.12 = 6,390.82 : x
  2. Step 2: Convert to fraction form
    13,781.08/20,660.12 = 6,390.82/x
  3. Step 3: Cross multiply
    13,781.08x = 20,660.12 × 6,390.82
  4. Step 4: Simplify right side
    13,781.08x = 132,035,108.10
  5. Step 5: Solve for x
    x = 132,035,108.10/13,781.08
  6. Step 6: Final answer
    x = 9,580.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.