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Finding the Fourth Proportional to 138,958.59, 208,334.21 and 65,069.31

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Solution

The fourth proportional to 138,958.59, 208,334.21 and 65,069.31 is: 97,555.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,958.59 : 208,334.21 = 65,069.31 : x
  2. Step 2: Convert to fraction form
    138,958.59/208,334.21 = 65,069.31/x
  3. Step 3: Cross multiply
    138,958.59x = 208,334.21 × 65,069.31
  4. Step 4: Simplify right side
    138,958.59x = 13,556,162,968.75
  5. Step 5: Solve for x
    x = 13,556,162,968.75/138,958.59
  6. Step 6: Final answer
    x = 97,555.42

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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.