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Finding the Fourth Proportional to 216,428.80, 324,643.20 and 163,940.80

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Solution

The fourth proportional to 216,428.80, 324,643.20 and 163,940.80 is: 245,911.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,428.80 : 324,643.20 = 163,940.80 : x
  2. Step 2: Convert to fraction form
    216,428.80/324,643.20 = 163,940.80/x
  3. Step 3: Cross multiply
    216,428.80x = 324,643.20 × 163,940.80
  4. Step 4: Simplify right side
    216,428.80x = 53,222,265,922.56
  5. Step 5: Solve for x
    x = 53,222,265,922.56/216,428.80
  6. Step 6: Final answer
    x = 245,911.20

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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.