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Finding the Fourth Proportional to 138,419.70, 207,629.55 and 103,427.70

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Solution

The fourth proportional to 138,419.70, 207,629.55 and 103,427.70 is: 155,141.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,419.70 : 207,629.55 = 103,427.70 : x
  2. Step 2: Convert to fraction form
    138,419.70/207,629.55 = 103,427.70/x
  3. Step 3: Cross multiply
    138,419.70x = 207,629.55 × 103,427.70
  4. Step 4: Simplify right side
    138,419.70x = 21,474,646,808.54
  5. Step 5: Solve for x
    x = 21,474,646,808.54/138,419.70
  6. Step 6: Final answer
    x = 155,141.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.