Home / 100,311.72-138,431.89-54,986.80

Finding the Fourth Proportional to 100,311.72, 138,431.89 and 54,986.80

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Solution

The fourth proportional to 100,311.72, 138,431.89 and 54,986.80 is: 75,882.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,311.72 : 138,431.89 = 54,986.80 : x
  2. Step 2: Convert to fraction form
    100,311.72/138,431.89 = 54,986.80/x
  3. Step 3: Cross multiply
    100,311.72x = 138,431.89 × 54,986.80
  4. Step 4: Simplify right side
    100,311.72x = 7,611,926,321.96
  5. Step 5: Solve for x
    x = 7,611,926,321.96/100,311.72
  6. Step 6: Final answer
    x = 75,882.72

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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.