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Finding the Fourth Proportional to 338,991.54, 508,486.80 and 139,171.17

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Solution

The fourth proportional to 338,991.54, 508,486.80 and 139,171.17 is: 208,756.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    338,991.54 : 508,486.80 = 139,171.17 : x
  2. Step 2: Convert to fraction form
    338,991.54/508,486.80 = 139,171.17/x
  3. Step 3: Cross multiply
    338,991.54x = 508,486.80 × 139,171.17
  4. Step 4: Simplify right side
    338,991.54x = 70,766,702,885.56
  5. Step 5: Solve for x
    x = 70,766,702,885.56/338,991.54
  6. Step 6: Final answer
    x = 208,756.55

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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.