Home / 100,143.87-138,213.72-57,123.15

Finding the Fourth Proportional to 100,143.87, 138,213.72 and 57,123.15

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Solution

The fourth proportional to 100,143.87, 138,213.72 and 57,123.15 is: 78,838.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,143.87 : 138,213.72 = 57,123.15 : x
  2. Step 2: Convert to fraction form
    100,143.87/138,213.72 = 57,123.15/x
  3. Step 3: Cross multiply
    100,143.87x = 138,213.72 × 57,123.15
  4. Step 4: Simplify right side
    100,143.87x = 7,895,203,059.62
  5. Step 5: Solve for x
    x = 7,895,203,059.62/100,143.87
  6. Step 6: Final answer
    x = 78,838.61

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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.