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Finding the Fourth Proportional to 393,640.20, 590,460.30 and 272,917.80

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Solution

The fourth proportional to 393,640.20, 590,460.30 and 272,917.80 is: 409,376.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,640.20 : 590,460.30 = 272,917.80 : x
  2. Step 2: Convert to fraction form
    393,640.20/590,460.30 = 272,917.80/x
  3. Step 3: Cross multiply
    393,640.20x = 590,460.30 × 272,917.80
  4. Step 4: Simplify right side
    393,640.20x = 161,147,126,063.34
  5. Step 5: Solve for x
    x = 161,147,126,063.34/393,640.20
  6. Step 6: Final answer
    x = 409,376.70

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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.