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Finding the Fourth Proportional to 321,986.40, 482,979.60 and 239,042.40

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Solution

The fourth proportional to 321,986.40, 482,979.60 and 239,042.40 is: 358,563.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,986.40 : 482,979.60 = 239,042.40 : x
  2. Step 2: Convert to fraction form
    321,986.40/482,979.60 = 239,042.40/x
  3. Step 3: Cross multiply
    321,986.40x = 482,979.60 × 239,042.40
  4. Step 4: Simplify right side
    321,986.40x = 115,452,602,735.04
  5. Step 5: Solve for x
    x = 115,452,602,735.04/321,986.40
  6. Step 6: Final answer
    x = 358,563.60

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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.