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Finding the Fourth Proportional to 328,879.80, 493,319.70 and 261,957.60

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Solution

The fourth proportional to 328,879.80, 493,319.70 and 261,957.60 is: 392,936.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,879.80 : 493,319.70 = 261,957.60 : x
  2. Step 2: Convert to fraction form
    328,879.80/493,319.70 = 261,957.60/x
  3. Step 3: Cross multiply
    328,879.80x = 493,319.70 × 261,957.60
  4. Step 4: Simplify right side
    328,879.80x = 129,228,844,644.72
  5. Step 5: Solve for x
    x = 129,228,844,644.72/328,879.80
  6. Step 6: Final answer
    x = 392,936.40

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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.