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Finding the Fourth Proportional to 393,409.20, 589,969.80 and 127,239.60

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Solution

The fourth proportional to 393,409.20, 589,969.80 and 127,239.60 is: 190,812.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,409.20 : 589,969.80 = 127,239.60 : x
  2. Step 2: Convert to fraction form
    393,409.20/589,969.80 = 127,239.60/x
  3. Step 3: Cross multiply
    393,409.20x = 589,969.80 × 127,239.60
  4. Step 4: Simplify right side
    393,409.20x = 75,067,521,364.08
  5. Step 5: Solve for x
    x = 75,067,521,364.08/393,409.20
  6. Step 6: Final answer
    x = 190,812.83

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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.