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Finding the Fourth Proportional to 399,787.30, 599,784.80 and 119,304.55

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Solution

The fourth proportional to 399,787.30, 599,784.80 and 119,304.55 is: 178,987.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,787.30 : 599,784.80 = 119,304.55 : x
  2. Step 2: Convert to fraction form
    399,787.30/599,784.80 = 119,304.55/x
  3. Step 3: Cross multiply
    399,787.30x = 599,784.80 × 119,304.55
  4. Step 4: Simplify right side
    399,787.30x = 71,557,052,661.92
  5. Step 5: Solve for x
    x = 71,557,052,661.92/399,787.30
  6. Step 6: Final answer
    x = 178,987.81

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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.