Home / 13,381.35-20,078.10-7,142.86

Finding the Fourth Proportional to 13,381.35, 20,078.10 and 7,142.86

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Solution

The fourth proportional to 13,381.35, 20,078.10 and 7,142.86 is: 10,717.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,381.35 : 20,078.10 = 7,142.86 : x
  2. Step 2: Convert to fraction form
    13,381.35/20,078.10 = 7,142.86/x
  3. Step 3: Cross multiply
    13,381.35x = 20,078.10 × 7,142.86
  4. Step 4: Simplify right side
    13,381.35x = 143,415,057.37
  5. Step 5: Solve for x
    x = 143,415,057.37/13,381.35
  6. Step 6: Final answer
    x = 10,717.53

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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.