Home / 67,128.21-100,685.81-20,381.49

Finding the Fourth Proportional to 67,128.21, 100,685.81 and 20,381.49

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Solution

The fourth proportional to 67,128.21, 100,685.81 and 20,381.49 is: 30,570.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,128.21 : 100,685.81 = 20,381.49 : x
  2. Step 2: Convert to fraction form
    67,128.21/100,685.81 = 20,381.49/x
  3. Step 3: Cross multiply
    67,128.21x = 100,685.81 × 20,381.49
  4. Step 4: Simplify right side
    67,128.21x = 2,052,126,727.75
  5. Step 5: Solve for x
    x = 2,052,126,727.75/67,128.21
  6. Step 6: Final answer
    x = 30,570.26

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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.