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Finding the Fourth Proportional to 328,087.80, 492,131.70 and 78,769.80

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Solution

The fourth proportional to 328,087.80, 492,131.70 and 78,769.80 is: 118,154.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,087.80 : 492,131.70 = 78,769.80 : x
  2. Step 2: Convert to fraction form
    328,087.80/492,131.70 = 78,769.80/x
  3. Step 3: Cross multiply
    328,087.80x = 492,131.70 × 78,769.80
  4. Step 4: Simplify right side
    328,087.80x = 38,765,115,582.66
  5. Step 5: Solve for x
    x = 38,765,115,582.66/328,087.80
  6. Step 6: Final answer
    x = 118,154.70

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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.