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Finding the Fourth Proportional to 100,710.70, 138,977.97 and 55,388.67

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Solution

The fourth proportional to 100,710.70, 138,977.97 and 55,388.67 is: 76,434.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,710.70 : 138,977.97 = 55,388.67 : x
  2. Step 2: Convert to fraction form
    100,710.70/138,977.97 = 55,388.67/x
  3. Step 3: Cross multiply
    100,710.70x = 138,977.97 × 55,388.67
  4. Step 4: Simplify right side
    100,710.70x = 7,697,804,917.60
  5. Step 5: Solve for x
    x = 7,697,804,917.60/100,710.70
  6. Step 6: Final answer
    x = 76,434.83

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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.