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Finding the Fourth Proportional to 138,880.38, 208,330.38 and 68,740.86

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Solution

The fourth proportional to 138,880.38, 208,330.38 and 68,740.86 is: 103,116.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,880.38 : 208,330.38 = 68,740.86 : x
  2. Step 2: Convert to fraction form
    138,880.38/208,330.38 = 68,740.86/x
  3. Step 3: Cross multiply
    138,880.38x = 208,330.38 × 68,740.86
  4. Step 4: Simplify right side
    138,880.38x = 14,320,809,485.33
  5. Step 5: Solve for x
    x = 14,320,809,485.33/138,880.38
  6. Step 6: Final answer
    x = 103,116.15

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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.