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Finding the Fourth Proportional to 100,628.93, 138,871.25 and 55,308.53

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Solution

The fourth proportional to 100,628.93, 138,871.25 and 55,308.53 is: 76,327.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,628.93 : 138,871.25 = 55,308.53 : x
  2. Step 2: Convert to fraction form
    100,628.93/138,871.25 = 55,308.53/x
  3. Step 3: Cross multiply
    100,628.93x = 138,871.25 × 55,308.53
  4. Step 4: Simplify right side
    100,628.93x = 7,680,764,696.76
  5. Step 5: Solve for x
    x = 7,680,764,696.76/100,628.93
  6. Step 6: Final answer
    x = 76,327.60

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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.