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Finding the Fourth Proportional to 100,687.06, 138,949.08 and 55,365.33

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Solution

The fourth proportional to 100,687.06, 138,949.08 and 55,365.33 is: 76,404.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,687.06 : 138,949.08 = 55,365.33 : x
  2. Step 2: Convert to fraction form
    100,687.06/138,949.08 = 55,365.33/x
  3. Step 3: Cross multiply
    100,687.06x = 138,949.08 × 55,365.33
  4. Step 4: Simplify right side
    100,687.06x = 7,692,961,667.40
  5. Step 5: Solve for x
    x = 7,692,961,667.40/100,687.06
  6. Step 6: Final answer
    x = 76,404.67

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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.