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Finding the Fourth Proportional to 392,690.80, 589,473.60 and 215,543.80

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Solution

The fourth proportional to 392,690.80, 589,473.60 and 215,543.80 is: 323,555.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,690.80 : 589,473.60 = 215,543.80 : x
  2. Step 2: Convert to fraction form
    392,690.80/589,473.60 = 215,543.80/x
  3. Step 3: Cross multiply
    392,690.80x = 589,473.60 × 215,543.80
  4. Step 4: Simplify right side
    392,690.80x = 127,057,379,743.68
  5. Step 5: Solve for x
    x = 127,057,379,743.68/392,690.80
  6. Step 6: Final answer
    x = 323,555.78

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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.