Home / 100,404.09-138,701.84-80,234.55

Finding the Fourth Proportional to 100,404.09, 138,701.84 and 80,234.55

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Solution

The fourth proportional to 100,404.09, 138,701.84 and 80,234.55 is: 110,838.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,404.09 : 138,701.84 = 80,234.55 : x
  2. Step 2: Convert to fraction form
    100,404.09/138,701.84 = 80,234.55/x
  3. Step 3: Cross multiply
    100,404.09x = 138,701.84 × 80,234.55
  4. Step 4: Simplify right side
    100,404.09x = 11,128,679,315.40
  5. Step 5: Solve for x
    x = 11,128,679,315.40/100,404.09
  6. Step 6: Final answer
    x = 110,838.90

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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.