Home / 129,090.37-178,145.42-72,501.75

Finding the Fourth Proportional to 129,090.37, 178,145.42 and 72,501.75

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Solution

The fourth proportional to 129,090.37, 178,145.42 and 72,501.75 is: 100,052.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,090.37 : 178,145.42 = 72,501.75 : x
  2. Step 2: Convert to fraction form
    129,090.37/178,145.42 = 72,501.75/x
  3. Step 3: Cross multiply
    129,090.37x = 178,145.42 × 72,501.75
  4. Step 4: Simplify right side
    129,090.37x = 12,915,854,704.49
  5. Step 5: Solve for x
    x = 12,915,854,704.49/129,090.37
  6. Step 6: Final answer
    x = 100,052.81

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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.