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Finding the Fourth Proportional to 218,295.57, 327,429.99 and 128,388

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Solution

The fourth proportional to 218,295.57, 327,429.99 and 128,388 is: 192,574.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,295.57 : 327,429.99 = 128,388 : x
  2. Step 2: Convert to fraction form
    218,295.57/327,429.99 = 128,388/x
  3. Step 3: Cross multiply
    218,295.57x = 327,429.99 × 128,388
  4. Step 4: Simplify right side
    218,295.57x = 42,038,081,556.12
  5. Step 5: Solve for x
    x = 42,038,081,556.12/218,295.57
  6. Step 6: Final answer
    x = 192,574.14

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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.