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Finding the Fourth Proportional to 409,811.20, 614,716.80 and 394,064.80

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Solution

The fourth proportional to 409,811.20, 614,716.80 and 394,064.80 is: 591,097.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,811.20 : 614,716.80 = 394,064.80 : x
  2. Step 2: Convert to fraction form
    409,811.20/614,716.80 = 394,064.80/x
  3. Step 3: Cross multiply
    409,811.20x = 614,716.80 × 394,064.80
  4. Step 4: Simplify right side
    409,811.20x = 242,238,252,848.64
  5. Step 5: Solve for x
    x = 242,238,252,848.64/409,811.20
  6. Step 6: Final answer
    x = 591,097.20

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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.