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Finding the Fourth Proportional to 192,428.87, 288,388.89 and 139,298.40

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Solution

The fourth proportional to 192,428.87, 288,388.89 and 139,298.40 is: 208,763.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    192,428.87 : 288,388.89 = 139,298.40 : x
  2. Step 2: Convert to fraction form
    192,428.87/288,388.89 = 139,298.40/x
  3. Step 3: Cross multiply
    192,428.87x = 288,388.89 × 139,298.40
  4. Step 4: Simplify right side
    192,428.87x = 40,172,110,954.78
  5. Step 5: Solve for x
    x = 40,172,110,954.78/192,428.87
  6. Step 6: Final answer
    x = 208,763.44

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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.