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Finding the Fourth Proportional to 353,081.64, 487,359.42 and 239,970

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Solution

The fourth proportional to 353,081.64, 487,359.42 and 239,970 is: 331,231.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,081.64 : 487,359.42 = 239,970 : x
  2. Step 2: Convert to fraction form
    353,081.64/487,359.42 = 239,970/x
  3. Step 3: Cross multiply
    353,081.64x = 487,359.42 × 239,970
  4. Step 4: Simplify right side
    353,081.64x = 116,951,640,017.40
  5. Step 5: Solve for x
    x = 116,951,640,017.40/353,081.64
  6. Step 6: Final answer
    x = 331,231.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.