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Finding the Fourth Proportional to 338,958.30, 508,416.50 and 139,273.56

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Solution

The fourth proportional to 338,958.30, 508,416.50 and 139,273.56 is: 208,901.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,958.30 : 508,416.50 = 139,273.56 : x
  2. Step 2: Convert to fraction form
    338,958.30/508,416.50 = 139,273.56/x
  3. Step 3: Cross multiply
    338,958.30x = 508,416.50 × 139,273.56
  4. Step 4: Simplify right side
    338,958.30x = 70,808,975,917.74
  5. Step 5: Solve for x
    x = 70,808,975,917.74/338,958.30
  6. Step 6: Final answer
    x = 208,901.73

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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.