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Finding the Fourth Proportional to 139,678.64, 209,400.60 and 113,318

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Solution

The fourth proportional to 139,678.64, 209,400.60 and 113,318 is: 169,881.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,678.64 : 209,400.60 = 113,318 : x
  2. Step 2: Convert to fraction form
    139,678.64/209,400.60 = 113,318/x
  3. Step 3: Cross multiply
    139,678.64x = 209,400.60 × 113,318
  4. Step 4: Simplify right side
    139,678.64x = 23,728,857,190.80
  5. Step 5: Solve for x
    x = 23,728,857,190.80/139,678.64
  6. Step 6: Final answer
    x = 169,881.79

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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.