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Finding the Fourth Proportional to 138,362.64, 207,388.44 and 68,291.16

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Solution

The fourth proportional to 138,362.64, 207,388.44 and 68,291.16 is: 102,359.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,362.64 : 207,388.44 = 68,291.16 : x
  2. Step 2: Convert to fraction form
    138,362.64/207,388.44 = 68,291.16/x
  3. Step 3: Cross multiply
    138,362.64x = 207,388.44 × 68,291.16
  4. Step 4: Simplify right side
    138,362.64x = 14,162,797,138.19
  5. Step 5: Solve for x
    x = 14,162,797,138.19/138,362.64
  6. Step 6: Final answer
    x = 102,359.98

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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.