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Finding the Fourth Proportional to 138,556.40, 207,895.80 and 67,439.60

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Solution

The fourth proportional to 138,556.40, 207,895.80 and 67,439.60 is: 101,189.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,556.40 : 207,895.80 = 67,439.60 : x
  2. Step 2: Convert to fraction form
    138,556.40/207,895.80 = 67,439.60/x
  3. Step 3: Cross multiply
    138,556.40x = 207,895.80 × 67,439.60
  4. Step 4: Simplify right side
    138,556.40x = 14,020,409,593.68
  5. Step 5: Solve for x
    x = 14,020,409,593.68/138,556.40
  6. Step 6: Final answer
    x = 101,189.19

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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.