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Finding the Fourth Proportional to 100,910.40, 139,250.88 and 55,579.56

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Solution

The fourth proportional to 100,910.40, 139,250.88 and 55,579.56 is: 76,696.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,910.40 : 139,250.88 = 55,579.56 : x
  2. Step 2: Convert to fraction form
    100,910.40/139,250.88 = 55,579.56/x
  3. Step 3: Cross multiply
    100,910.40x = 139,250.88 × 55,579.56
  4. Step 4: Simplify right side
    100,910.40x = 7,739,502,640.01
  5. Step 5: Solve for x
    x = 7,739,502,640.01/100,910.40
  6. Step 6: Final answer
    x = 76,696.78

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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.