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Finding the Fourth Proportional to 418,768.80, 628,153.20 and 399,085.80

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Solution

The fourth proportional to 418,768.80, 628,153.20 and 399,085.80 is: 598,628.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    418,768.80 : 628,153.20 = 399,085.80 : x
  2. Step 2: Convert to fraction form
    418,768.80/628,153.20 = 399,085.80/x
  3. Step 3: Cross multiply
    418,768.80x = 628,153.20 × 399,085.80
  4. Step 4: Simplify right side
    418,768.80x = 250,687,022,344.56
  5. Step 5: Solve for x
    x = 250,687,022,344.56/418,768.80
  6. Step 6: Final answer
    x = 598,628.70

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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.